Full Details

Name and Model Number System Tombeur, Pocket Simple - S3
Country of Origin England
Date of Manufacture 2012
Front Scales A [C]
Back Scales None
Scale Length 130 mm
Type of Rule Slide Rule
Construction Walnut, Paper, Perspex
Area of Use Other
Comment Handmade pocket slide rule for basic juggling calculations.
Designed and made by Colin Tombeur.
Rarity RRR
Donor Collection of Colin Tombeur
Match Number 73

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.