Full Details

Name and Model Number Eureka (made by Kratz-Boussac)
Country of Origin France
Date of Manufacture 1892
Construction Cardboard and nickeled metal
Area of Use Education
Comment Capacity Simple calculations : addition and subtraction (with the central disc),
multiplication and division (with mechanical index)
The backround chromolithograph (as Mucha) is superb.
Rarity RRRR
Donor Collection of French gentleman
Match Number 403
(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.