JC Penney MM3R Handheld Electronic Calculator


This four-function calculator has a tan plastic case, an array of ten oval digit keys, and a decimal point key. It also has four blue arithmetic function keys to the right of these and has clear entry and clear keys to the left. A constant switch is above the clear keys. The on/off switch is on the right above the keyboard. A mark to the left of it reads: JCPenney. The eight-digit LED display is at the back. The back edge has a socket for a power adapter.

A sticker on the back reads: JCPenney (/) Electronic Calculator (/) VOLTAGE 6V CURRENT 0.2A (/) MODEL MM3R SERIAL No. 126131 (/) Made in U.S. A.

This model is similar to the Commodore MM3R and probably was made by Commodore.

J. C. Penney is a chain of American department stores.


Guy Ball and Bruce Flamm, The Complete Collector’s Guide to Pocket Calculators, Tustin, CA: Wilson/Barnett, 1997, pp. 81–82.

Date Made: ca 1975

Maker: J.C. Penney Company

Location: Currently not on view

Place Made: United States

See more items in: Medicine and Science: Computers, Computers & Business Machines, Handheld Electronic Calculators


Exhibition Location:

Credit Line: Gift of John B. Priser

Data Source: National Museum of American History

Id Number: 1986.0988.271Catalog Number: 1986.0988.271Accession Number: 1986.0988

Object Name: electronic calculator

Physical Description: plastic (case; display cover; keys material)gallium arsenide (display chips material)metal (circuitry material)paper (sticker material)Measurements: overall: 2.5 cm x 7.4 cm x 10 cm; 31/32 in x 2 29/32 in x 3 15/16 in

Guid: http://n2t.net/ark:/65665/ng49ca746ab-f249-704b-e053-15f76fa0b4fa

Record Id: nmah_1305804

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