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
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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.