Upper Scale (423)
- Crown:
- "MADE IN ENGLAND"
- Top:
- "PATENT No. 183723"
- Bottom:
- "COPYRIGHT. SCALE No. 423"
"OTIS KING'S POCKET CALCULATOR"
Lower Scale (414)
- Top:
- "PATENTEES * SOLE MANUFACTURERS; CARBIC LIMITED,
51 HOLBORN VIADUCT, LONDON E.C.1"
- Bottom:
- "OTIS KING'S PATENT No. 183723"
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