Full Details

Name and Model Number Blundell- Harling
(BRE) Model AG5
Country of Origin England
Date of Manufacture 1950's
Front Scales K A B CI C D M
Back Scales S ST T on back of slider
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction Astrolan Plastic, metal framed 3 line cursor, in an imitation leather covered wood box with brass hinges
Area of Use Generic
Comment General calculations
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 373
(Click Picture for Details)

In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen
(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.
• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.
• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.
• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.