Full Details

Name and Model Number Faber-Castell 345
System Dr. Hohenner
Country of Origin Germany
Date of Manufacture 1912 - 1935
Front Scales A, B, C, D
Back Scales none
Scale Length 25 cm
Type of Rule Slide Rule
Construction Celluloid on pearwood
Area of Use Topography
Comment For calculating altitude differences by 2 given barometric pressures.
Rarity RRR
Donor Collection of Peter Holland, Germany
Match Number 228
(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.