Otis King's Pocket Calculator

A9123

Upper Scale (430)
Crown:
"MADE IN ENGLAND"
Top:
"PATENT No. 183723"
Bottom:
"SCALE No. 430"
"OTIS KING'S POCKET CALCULATOR"
Lower Scale (429)
Top:
"PATENTEES & SOLE MANUFACTURERS; CARBIC LTD, 51 HOLBORN VIADUCT, LONDON E.C.1
SCALE No 429 COPYRIGHT"
Bottom:
"OTIS KING'S PATENT No. 183723"

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