Full Details

Name and Model Number Lutz 300B
Country of Origin Japan
Date of Manufacture Mid 1960s to Early 1970s Based on Cursor Style
Front Scales Sh1 Sh2 Th A [B T/Cot ST/ST S/Cos C ] D DI P K
Back Scales LL/1 LL/2 LL/3 DF [ CF CIF L CI C ] D LL3 LL2 LL1
Scale Length 25 cm
Type of Rule Slide Rule
Construction Body Celluloid on bamboo, cursor plastic
Area of Use Generic
Comment Same size as Ricoh 151. Scale set similar to Ricoh 151 with the following differences: addition of hyperbolic sin and tan scales, scales swapped front to back, deletion of LL0 and LL/0 scales, L scale moved to slide. Considered to be one of the rarest hyperbolic slide rules by William K Robinson ( http://ww2.hyperbolicsliderules.com:8110 ).
Rarity RRR
Donor Photo courtesy of Jodie Hobson
Match Number 384
(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.