- 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"
