Full Details

Name and Model Number Heath Hezzanith Carmody
Country of Origin England
Date of Manufacture  
Front Scales ins/ LL2, A [B, CI, C] D, LL3
Back Scales [S, ST, T]
Scale Length 25.0 cm + 2.5 cm extension
Type of Rule Slide Rule
Construction Plastic
Area of Use Generic
Comment Back of rule contains a table of Haversines.
Rarity RR
Donor Collection of Rod Lovett
Match Number 16

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.