Full Details

Name and Model Number Pickett X-4 Executive
Country of Origin USA
Date of Manufacture ?
Front Scales LL1, LL2, DF/m [ CF/m, TH, SH, Ln, L, CI, C ] D, LL3+.D/-.D, LL4+D./-D.
Back Scales 31, 32, 3 , DF [ CF, CIF, T1, T2, ST, S Cos, CI, C ] D, DI, 1, 2
Scale Length 25 cm
Type of Rule Slide Rule
Construction Aluminum
Area of Use Generic
Comment Executive X-4 Vector Type Log Log - Dual Base Speed Rule.
Based on Pickett model N4.
Made for Pickett executives.
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 241
(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.