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Silver Seiko Union M (SR 81)

The Silver Seiko Union M is an arithmetic calculator with 8 digits precision and algebraic logic. It has 6 functions, 23 keys, and a VFD (vacuum fluorescent) display. The power source is AA batteries.

Facts at a glance:

FeatureValue
TypeArithmetic
Functions6
Keys23
Precision8
LogicAlgebraic
Display typeVFD
Length116mm
Width74mm
Thickness19mm
Power Consumption0.100000W
Power SourceAA
Year introduced1978

Replacements:

If you have a Silver Seiko Union M that is no longer working, you can first try replacing the AA battery. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements:

See other calculators by Silver Seiko