Lot 238

Sir Barnes Wallis 'Dam Busters' Collection auction held on Wednesday 25th of March 2026

A 1960's slide rule by Graphoplex Brevete S.G.D.G, the reverse stamped SVENSKA DIAMANTBERGBORRNINGS AB, 15cm x 3cm, contained in a red leather case, a pair of steel drafting compasses 11cm and a The Aristo Studio slide rule instruction manual (missing front page, folded and with light staining)