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:
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: