Pocket Adding Machines/Calculators

Kingson

This example is probably from the 1940-50s when it would have cost about six or seven shillings (30-35 pence in today's money). The length is 6.3 inches (16 cm). Width 1.5 inches (3.8 cm). Weight in case 50gm. (Convert to ounces yourself).
Note the fractions to decimal conversion table printed on the bottom of the calculator.

Kingson-1