PTK 1050Model: PTK-1050 
Battery: BP6, BP7
Adapter: AC9131, AC9132
Year: 1979
Chip: TMC1501          
Info: This PTK-1050 (1979) is one of several calculators sold by the Híradástechnika in Budapest, Hungary in the 1970s. It is 100% identical to the TI-57, on the left built in the USA, on the right built in the EU.adio Shack