Full Details

Name and Model Number Dietzgen. Unknown model
Country of Origin USA
Date of Manufacture  
Front Scales A=BC=D
Back Scales  
Scale Length 5 ins
Type of Rule Slide Rule
Construction Cardboard
Area of Use Generic
Comment I believe this slide rule probably dates to the late 1800s, though could be early 1900s.
It is made of paperboard (cardboard) and has that famous old style metal cursor.
Rarity RR
Donor Collection of Wayne Harrison
Match Number 407
(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.