The Pocket Adding Machine
Attached is a photo of the " The Pocket Adding Machine". It is complete with mock snakeskin slip case (not shown), stylus and instructions and probably dates from the 1920s. It measures 4.8" x 3" and is basically a Sterling version of the "Procalculo". The machine front has a rather faded finish.
Best regards
David M Riches

Source: David Riches's Collection

X-Number World of Calculators