Non-Decimal Calculators

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Sterling Currency Calculators
Bowler Countess

Countess Sterling Adding Machine

Countess.

135 x 170 x 130 mm (5.3" x 6.7" x 5.1").

"Foreign Made", 1950s - 1960s.

Addition only by moving the wheels by finger.

Clear to zero by turning the crank.

A decimal version was also available.

 

These are fairly sturdily made calculators. There were also many cheaper all-plastic machines made.

Vintage Calculators

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