TI 0053 slanted RCIModel: TI-53 slanted
Battery: 2 x LR44
Adapter: 
Year: 1985 ( RCI 17 85 )
Chip:  TPO323
Info: Calculator donated by Ludovisi Giancarlo in 2023 during the 2nd edition "the story with Texas Instruments" in Rieti, (World Chili Pepper Fair).