Full Details

Name and Model Number Aristo 944 Schweizer
Country of Origin Germany
Date of Manufacture ~1937
Front Scales cm/E-R, A [sin.cos, cos^2, C] T1, T2, T3
Back Scales [B, sin, sin^2]
Scale Length 25 cm
Type of Rule Slide Rule
Construction Plastic
Area of Use Topography
Comment Severely warped.
Rarity RRR
Donor Collection of Rod Lovett
Match Number 4

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.