Sperry Remington 661-D (661D)
The Sperry Remington 661-D is an arithmetic calculator with 6 digits precision and algebraic logic. It has 5 functions, 18 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAA. The calculator was manufactured in Japan. Note: 6 digit display, 12 digits internal precision
Facts at a glance:
If you have a Sperry Remington 661-D that is no longer working, you can first try replacing the 4xAA batteries. 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: