​Both non-standard scales folded & apart from NESTLER name in well no other markings

Railway track scales + German silver screws + cm scale in well of stock + patent no. 173660 + table of conversion factors on back

Railway track scales + German silver screws + cm scale & 4 slits in well of stock + patent no. 164885 + table of conversion factors on back

German silver screws + inch scale in well of stock + table of conversion factors compiled by C.N. Pickworth on back

Unusually unmarked (pi mark = Nestler) & incised scales + table of conversion factors in English on back​

2 cursor windows in back

aku CMC printed on back + 2 cursor windows

2 cursor windows in back​

primarily for imperial/metric conversions with many gauge marks on front face + WEATHERFORD printed on back + 2 cursor windows

OEM by FUJI but retailed through Hope Slide Rule Mfg. Co. - has big-brother 0291 sibling

Unusually W & V scales on front face + 2 cursor windows in back ​

Instruction rule for model 0251 - Rietz layout but all scales on front face ​

Table of conversion factors & two cursor windows in back

tables of conversion factors on back

Table of conversion factors on back + 2 cursor windows

​Late wooden model - table of conversion factors on back + 2 cursor windows

tables of conversion factors on back

Table of conversion factors & 2 cursor windows in back

Cheaper construction​ & possible OEM by Japanese Fuji + 2 cursor windows in back

OEM by Japanese Fuji  but retailed through Hope Slide Rule Mfg. Co. ​

Cheaper construction​ & possible OEM by Japanese Fuji  + “Half-duplex” layout with trig scales on back of closed frame stock - part of mini Secondary School series

Cheaper construction​ & possible OEM by FUJI - part of mini Secondary School series

Cheaper construction​ & possible OEM by FUJI - part of mini Secondary School series

Cheaper construction​ & possible OEM by FUJI - part of mini Secondary School series

Table of guidelines for turning speeds + 2 cursor windows in back

Table of constants on back + bigger sibling 0275

Tables of conversion factors + 2 cursor windows in back - long scales (folded @ Pi) & desktop model meant accuracy of 0.03% + smaller sibling 0270

 OEM by FUJI but retailed through Hope Slide Rule Mfg. Co. - see also smaller 0129 sibling ​

​Specially marketed to Petroleum Industry for crude oil related calculations

​Top 2 scales & top scale on back of slide = plethora of gauge marks = table of elements & molecular weights

Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) - 2 cursor windows in back​ + bigger sibling 0375

Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) - table of conversion factors & 2 cursor windows in back​ + smaller sibling 0370

Stress factors 1200 & 1400kg/cm² of iron on either side of slide

​Designed by Dutchman M.C.M. van Maarschalkerwaart but Nestler felt his full surname was too long for the System accreditation & hence shortened it!

​German sliver screws + table of conversion factors on back + 2 cursor windows

extremely narrow & Lilliput-like footprint with no model/maker markings on rule + 2 cursor windows in back​

German silver screws + Table of conversion factors & 2 cursor windows in back

Broader than other in 11xx series​ 2 cursor windows in back

orange/dirty-brown celluloid with 2 cursor windows in back

2 cursor windows in back​

unnecessarily 2 cursor windows in back​

2 cursor windows in back

V & W scales in well of stock + 2 cursor windows in back

2 cursor windows in back

Model no. etc on back + 2 cursor windows​

cm & inch scale on back + 2 cursor windows

unmarked but reseller, P. Trumel, in well of stock + table of conversion factors on back + 2 cursor windows

cm scale in well of stock + table of conversion factors on back + 2 cursor windows + unusual combination of magnifying cursor & extra tick marks emulates precision of 25cm model  

cm scale in well of stock + table of conversion factors on back + 2 cursor windows

Unusual length + railway track scales + German silver screws + cm scale in well of stock

cm scale in well of stock + tables of conversion factors on back

Kiel name (like F-C 1/94) comes from being the model favoured by German Imperial Naval Academy & School Kiel  - table of conversion factors on back + 2 cursor windows​

​Owned & used as a student by legendry Swiss collector Heinz Joss - 2 cursor windows in back

cm scale in well of stock + table of conversion factors on back

cm scale in well of stock + table of conversion factors on back + 2 cursor windows

cm scale in well + table of conversion factors on back + 2 cursor windows

Unusual scale length​ - tables of conversion factors on back

cm scale in well + table of conversion factors on back + 2 cursor windows

table of conversion factors on back + 2 cursor windows

table of conversion factors on back + 2 cursor windows

cm scale in well of stock + tables of conversion factors on back - ex Shell (B.P.M.)

Not demonstration type but 10f only 4 engine-divided (only maker capable of desktops >50cm) + early production year from 1908-1911 style of company name - read more ....​

cm scale in well of stock + tables of conversion factors on back

Not demonstration type but 1 of only 4 engine-divided 100cm models (only maker capable of engine dividing desktops >50cm)​

Table of machining speeds on back + 2 cursor windows

C & D long scales folded @ Pi + S & T also long-scale + cm scale in well of stock + tables of conversion factors on back & two cursor windows + see also larger sibling 

C & D long scales folded @ Pi + S & T also long-scale + desktop model meant accuracy of 0.03% + cm scale in well of stock+ tables of conversion factors on back - long scales (folded @ Pi) & - see also smaller sibling 

German silver screws - table of conversion factors on back + 2 cursor windows + see bigger sibling

Tables of conversion factors on back - model later replaced by 0286 Geometer + see smaller sibling

SUPPLIED BY ASTON & MANDER LONDON in well

For all aspects of timber industry (round & square timber ) - same model used by Albert Nestler (1851-1901) to calculate raw material needed for making wooden slide rules - cm & inch scales + 3rd party name Vollmer-Werke A.G.

German sliver screws - table of atomic weights on back

​Narrow stock - German sliver screws - table of atomic weights on back + 1 cursor window

Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) - table of conversion factors on back + 2 cursor windows

Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) + cm scale in well of stock + German silver screws - table of conversion factors on back + 2 cursor windows

Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) + monochrome with no CI but cm scale in well of stock + German silver screws - table of conversion factors on back + 2 cursor windows

Top non-standard scale is for rapid calculation of tension losses in copper wires + bottom non-standard scale is for calculating peripheral velocities (D scale displaced by pi/6 or 0.5326) + cm scale in well of stock - conversion tables on back + 2 cursor windows​

German silver screws + cm scale in well of stock + Table of constants on back

39 is one of the model no.‘s Nestler illogically reused for 2 totally different types + extremely unusual layout of scales (DBGM for Erwin Besser) + table of constants on back ​

​Retailer’s name also in well

Unusual incised scales + 1 cursor window in back 

German silver screws + table of conversion factors & 1 cursor window in back

Narrow stock & probably earliest model specifically made by any maker for commerce + ​German silver screws + 1 cursor window in back

Unusual scale layout + British pound sterling (£ s d) scales on back of slide + conversion tables on back

cm & inch scale on back + 2 cursor windows​

unnecessarily 2 cursor windows in back

Stress factors 1200 & 1400kg/cm² of iron on either side of slide + table of factors on back & 2 cursor windows

Largest of only 3 cylinder/drum models

Table of conversion factors on back painted white

Table of conversion factors printed on back - cheaper construction (e.g. no German silver screws) but still quality finish

Table of conversion factors on back painted white

2 cursor windows in back

Modern day 360 degree Winkel in Grad version of High Altitude Calculator for German Armed forces (NATO NSN No.: 6660-12-127-6307) for global missile trajectories or possibly jet stream & its effect on missiles or planes flying at high altitude + read more ...

Special commission for L’arme blindée et cavalerie (ABC) or Armoured Cavalry Arm of French Army + 2 unnecessary cursor windows in back

Specially commissioned fallout calculator for German Armed Forces (NATO NSN no.: 6665-12-136-1506) & ABC = Atomic, Biological & Chemical -- table on back lists battlefield fallout compensation/reduction factors + read more ...

Specially commissioned calculator for vehicles travelling in column formation made for the Belgian Army (ABL) but relationship to Westf. Versandhaus is unknown - Inch scale on back

Specially commissioned by Bochum-based German supplier of air conditioning and refrigeration technology Gesellschaft für Entstaubungsanlagen (GEA AG) + railway track scales & German silver screws + table of constants & 2 cursor windows in back 

Specially commissioned by Vereinigte Glanzstoff-Fabriken AG + company name & logo’s on back + more textile constants + 2 cursor windows

Specially commissioned by the Zittau-based leading German sewing thread supplier Herman Schubert + ​deceivingly nondescript Mannheim layout was later granted a German DRGM registered design (1454414) on 18-11-1938 because of the thread size table on back & later modified cursor

Unmarked 11O special commission for Landis & Gyr A.G. - co. name printed on back with two unecessary cursor windows

Unmarked 11ZR special commission for Landis & Gyr A.G. - co. name printed on back with two cursor windows

Special commission for German Luftwaffenamt (Air Force) + German sliver screws - continuation of 1:30000000 top-edge scale in well +  blind stamp in back indicates military provenance 

Pre-engineered generic model made here for German Friedrich Krupp AG - back of the cursor innovatively doubles up as a clip for jacket or shirt pocket + read more ...

Special commission consisting of a 4-part ruler (one part missing) possibly for Wolterstorff to measure the size & shape of the female form for a made-to-measure jacket/coat  

Special commission possibly for British maker/retailer A.G.Thornton but with a stock width associated more with a Mannheim type - table of constants on back + 1 cursor window.

Non-military ABC (Atomic, Biological & Chemical) fallout calculator specially made for German company: Total KG Foerstner & Co.