SPERRY REMINGTON 665

Description

Brand: SPERRY REMINGTON
Model: 665
Type: Calculator
Picture: SPERRY REMINGTON 665
Batteries: AA x 4
Lifetime: Introduced: 1974
Terminated: unknown
Notes: Knowing that SPERRY REMINGTON has many OEM Casio models, this model is functionally equivalent to the CASIO-MINI CM-605.

There is an article about this calculator on the National Museum of American History website here (link validated 2025-12-06). This page mentions that a Casio website refers to this calculator as being an OEM version of the CASIO-MINI CM-605, despite it having a completely different for factor.

If you compare the main PCB’s of both calculators it can be seen that they are the same. Only the PCB of the keyboard and power switch differ.

The mycalcdb.free.fr Calculator Database website has pictures of both of them.

See the CASIO version here (link validated 2025-12-07).
See the SPERRY REMINGTON version here (link validated 2025-12-07).

All four batteries in its battery compartment face the same way.

Peripherals

A power adapter, the AD-4145.


©2025 Ernst Mulder