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.

The main differences between the original and the badged calculators are the olive-green colour 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.