Longines Symphonette Electronic Calculator Version 1

Date of introduction:  1972 Display technology:  LED modules
New price:   Display size:  8
Size:  5.5" x 3.0" x 1.7"
 139 x 76 x 42 mm3
Weight:  11.4 ounces, 322 grams Serial No:  D1000-08277
Batteries:  6*AA NiCd (internal) Date of manufacture:  
AC-Adapter:  unknown Origin of manufacture:  USA
Precision:  AC9100 Integrated circuits:  TMS0119
Program steps:   Courtesy of:  Joerg Woerner

This calculator sold by Longines Symphonette could be easily recognized as a Texas Instruments Datamath calculator. It followed the Electronic Calculator introduced few month earlier.

Compare-BackV1.jpg (80058 Byte)Compare-FrontV1.jpg (64133 Byte)The main differences between the original and the badged calculators are the olive-green color of the housing, the grey keys and the Longines Symphonette label. 

In a direct comparison with the later models sold by Longines Symphonette, this one uses 6 rechargeable NiCd batteries under the hood. You'll notice the CE/D-key on the upper left of the calculator, this key recalls the display. To reduce power consumption the electronics of this calculator will shut down most part of the display after few seconds of non use.

A more detailed comparison between the seven known Datamath Versions could be found here. Currently three of them are reported to be sold under the Longines Symphonette label:

TI-2500 Version 1
TI-2500 Version 2

We expect that about 18,000 Longines Symphonette Version 1 calculator were sold in the olive-green housing. All Version 1 models with serial numbers above D1000-18000 use the standard housing known from the Texas Instruments Datamath calculator. Find an off-white colored Longines Symphonette Electronic Calculator Version 1 here.

Datamath is a trademark of Texas Instruments.

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If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.