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:  D1000-20495
Batteries:  6*AA NiCd  Date of manufacture:  year 1973
AC-Adapter:  unknown Origin of manufacture:  USA
Precision:  AC9100 Integrated circuits:  TMS0119
Program steps:   Courtesy of:  Frank Boehm

Longines_V1_Compare.jpg (64390 Byte)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.

Longines_V1_c_back.jpg (34438 Byte)This Longines Symphonette with one of the highest reported serial numbers (D1000-20495) looks very familiar to us.
Fellow collector Kai-Uwe Rommel reported in October 2015 serial number D1000-21646...

Longines_V1_c_PCB.jpg (75979 Byte)Dismantling this late Longines Symphonette Version 1 calculators reveals an expected manufacturing date of February 1973. Texas Instruments introduced the Datamath Version 2 in February this year, too.

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Joerg Woerner, March 6, 2004. No reprints without written permission.