Full Details

Name and Model Number Faber Castell 366, System Schumacher
(Hand-made / Nachbau version)
Country of Origin Original Germany. Hand-made version U.K.
Date of Manufacture Original Around 1909. Hand-made version - 2012
Front Scales Original N1 [N2 I2] I1 plus N -> I table on cursor.
Hand-made version I1 N1 [ N2 I2] plus free-spinning N -> I table at centre of rule.
Back Scales None
Scale Length Original outermost scale c. 44cm; immermost c 31cm. Hand-made version outermost scale c. 68cm; innermost c. 48cm.
Type of Rule Slide Rule
Construction Wood
Area of Use Other
Comment An unusual rule, constructed for educational purposes, capable of multiplication of one- and two-digit numbers only.
Also arbitrary powers and logarithms. Works in modulo 101. Divisions are equally spaced; not logarithmically scaled.
German manual at: http://rechnerlexikon.de/files/Schum1909.pdf
English translation of above at:
Rarity RRRR
Donor Collection of Jerry McCarthy
Match Number 69

RR = Rare -- 1 of 25 collectors has one; it may take a year to find an example in the marketplace.   
RRR = Very rare -- only very few known to collectors; may take several years before one comes up for sale.   
RRRR = Extremely rare -- a museum piece; unlikely that an example will ever come up for sale.