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Model: TI-561-11 (TI-500 prototype)Code: Ok
Battery: 309
WCase: black plastic WBand: rubber matching bracelet Face: blue frame
Manual: Yes Box: No Lamp: bulb
Year: 1980 Price: xxxx
Function: The watch has six functions- hours, minutes, seconds, month , date and light
Info: prototype created in the Rieti laboratories, for possible productions, red and green buttons, the same model with the writing TI-500 TI-561-11
Model: TI-565-10 (TI-250) Code: Ok
Battery: 309
WCase: black plastic WBand: rubber matching bracelet Face: blue frame
Manual: Yes Box: No Light: bulb
Year: 1980 Price: xxxx
Function: The watch has six functions- hours, minutes, seconds, month , date and light
Info: gray buttons, the same model without the writing TI-565-11
Model: TI-565-11Code: Ok
Battery: 309
WCase: black plastic WBand: rubber matching bracelet Face: blue frame
Manual: YesBox: No Light: bulb
Year: 1980 Price: xxxx
Function: The watch has six functions- hours, minutes, seconds, month , date and light
Info:gray buttons, the same model with the writing Texas Instruments TI-565-10