Full Details

Name and Model Number Aristo Pencil Slide Rule
Country of Origin Germany
Date of Manufacture Estimate 1950-60s
Front Scales C D
Back Scales None
Scale Length 10 cm (4 inches)
Type of Rule Slide Rule
Construction Metal scales celluloid on metal
Area of Use Generic
Comment This novelty pencil slide rule is a well made metal rule.
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 317
(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.