Keuffel & Esser 68 1892 10″ Plastic Mannheim Beginner’s Slide Rule, Desktop Version – MHF-36


No Serial Number

Manual in Box: “Learning to Use the Slide Rule, Step-by-Step, Easy-to-Follow Instructions for the K12 Prep Slide Rule”, Copyright 1961, Back Cover Number S24-2

Clark McCoy’s K&E Catalogs – 4058 Information page

Catalog Number: MHF-36, Location MHF-D2