Full Details

Name and Model Number Faber-Castell 342 Columbus
System Rohrberg
Country of Origin Germany
Date of Manufacture 1923 - 1929
Front Scales Commercial scales
Back Scales none
Scale Length 25 cm
Type of Rule Slide Rule
Construction Celluloid on ebonywood
Area of Use Other
Comment For commercial calculations. Only very few were made from ebonywood.
Rarity RRR
Donor Photo courtesy of Peter Holland, Germany
Match Number 6
(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.