Full Details

Name and Model Number Aristo 80123
Martin Space Rule
Country of Origin Germany
Date of Manufacture ~1962
Front Scales 5 specialised [3 specialised, C] D, 2 specialised
Back Scales 12 specialised [6 specialised]
Scale Length 14.0 cm maximum
Type of Rule Slide Rule
Construction Plastic
Area of Use Other
Comment A rule for space and orbital calculations.
Rarity RRR
Donor Collection of Rod Lovett
Match Number 8

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.