TI 2500 longines 1 ver 00TI 2500 longines 1 ver 01TI 2500 longines 1 ver 02Model: TI-2500 Longines Symphonette 1 version
Battery: 6 x AA ni-cd internal
Adapter: AC9100
Year: 1972
Chip: TMS0119
This calculator sold by Longines Symphonette could be easily recognized as a Texas Instruments Datamath calculator. It followed the Electronic Calculator ioduced few month earlier. 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 la.