Keystone 390 Handheld Electronic Calculator
date: label: date made
content: 1973-1974
name: label: maker
content: Keystone
notes: label: Description
content: Some early manufacturers of electronic calculators began as makers of photographic equipment. One of these was the Keystone Division of Berkey Photo, Inc. Keystone Camera Company traced its origins to a company founded in Boston, Massachusetts in 1910. Early products included movie cameras and projectors. In 1966, Berkey Photo, Inc. acquired Keystone. By 1973, the Keystone Camera Division of Berkey, with its factory in Clifton, New Jersey, had expanded to making instant-load cameras with electronic flash. It also, from late 1972 until at least 1975, made handheld electronic calculators.
label: Description
content: The Keystone 390 handheld electronic calculator has a black plastic case with gray trim, a metal keyboard, and twenty plastic keys. The keys are square with circular tops. In addition to ten digit keys, a decimal point key, a total key, four arithmetic function keys, and a cancel key, the calculator has a percentage key and two memory keys. Buttons above the keyboard can be used to set the display for numbers or dollars and cents and to turn on the memory. A mark next to these reads: Keystone (/) 390.
label: Description
content: At the back is an eight-digit display. Text along the front edge reads: Made in U S A. The socket for a power adapter and the on/off switch are at the back edge.
label: Description
content: A sticker on the back of the calculator gives operating instructions. It is marked at the bottom: Keystone (/) PARAMUS, NEW JERSEY 07652 SERIAL #C174364. The calculator has a black plastic zippered carrying case. A cloth tag on the inside reads: MADE IN TAIWAN.
label: Description
content: Advertisements list the price of the calculator as $107.95 (1973) down to $47.50 (1974).
label: Description
content: Compare 1986.0988.368.
label: Description
content: References:
label: Description
content: [Advertisement], <I>New York Times</I>, September 15, 1973, p. 15. Ad lists Berkey Keystone calculators #350, #370, #390, and #395. Model 390 is on sale for $107.95.
label: Description
content: [Advertisement], <I>New York Times</I>, March 30, 1974, p. 64. Ad lists Berkey Keystone calculators #350, #370, #390, and #395. Model 390 is on sale for $107.95.
label: Description
content: [Advertisement], <I>New York Times</I>, September 8, 1974, p. 153. Ad lists Berkey Keystone calculators #350, #370, #390, and #395. Model 390 on sale for $69.50.
label: Description
content: [Advertisement], <I>New York Times</I>, November 17, 1974, p. 193. Ad lists Berkey Keystone calculators #350, #370, #390, #395, #2030, 2040, and #2050. The ad indicates that the Model 390 is on sale for $47.50.
label: Location
content: Currently not on view
place: label: place made
content: United States: New Jersey, Paramus
setName: label: See more items in
content: Medicine and Science: Computers
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content: Computers & Business Machines
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content: Handheld Electronic Calculators
creditLine: label: Credit Line
content: Gift of John B. Priser
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1986.0988.366
label: catalog number
content: 1986.0988.366
label: accession number
content: 1986.0988
objectType: label: Object Name
content: electronic calculator
physicalDescription: label: Physical Description
content: glass (display material)
label: Physical Description
content: metal (keyboard; circuitry material)
label: Physical Description
content: plastic (case; keys; carrying case; trim material)
label: Measurements
content: overall: 1 3/4 in x 3 in x 5 1/4 in; 4.445 cm x 7.62 cm x 13.335 cm