Full Details

Name and Model Number Keuffel & Esser DECILON
Country of Origin USA
Date of Manufacture Last patent 1961 must have been mfg. in the 1960s
Front Scales SQ1 Sq2 DF CF CIF L CI C D Ln0 Ln1 Ln2 Ln3
Back Scales LN-3 Ln-2 Ln-1 Ln-0 A B T SRT S C D DI K
Scale Length 12 cm (5 in)
Type of Rule Slide Rule
Construction White plastic, adjustable aluminum end brackets beautiful leather case
Area of Use Generic
Comment Beautiful well made top of the line K&E rule
Rarity RR
Donor Collection of Clay Castleberry
Match Number 326
(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.