Full Details

Name and Model Number Chadwick Swiss Army
Slide Rule
Country of Origin Japan
Date of Manufacture 1950 - 1960s
Front Scales A B Ground speed
Back Scales None
Scale Length 9.5 cm (3.7 in) for the longest scale
Type of Rule Slide Rule
Construction Circular slide rule, knife blade, fingernail file and money clip
Area of Use Generic
Comment A novelty slide rule for the flying trade. See JOS v18-n2-2009- Title: Multitasking Slide Rule for the 1950s
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 328
(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.