Full Details

Name and Model Number A.W. “Von” Faber
Country of Origin Germany
Date of Manufacture mid 1800’s est.
Front Scales A B C D
Back Scales S L T
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction Boxwood or pearwood
Area of Use Generic
Comment Only very early Fabers had “Von” Faber markings – sorry, no cursor
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 307
(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.