Full Details

Name and Model Number Stanley of London
With Decimal Keeper
Country of Origin England
Date of Manufacture About 1925 to 1926
Front Scales A B CI C D
Back Scales S L T located on back of slider
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction Celluloid on Mahogany
Area of Use Generic
Comment General calculations with decimal keeper. See my JOS article on decimal keeper slide rules.
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 314
(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.