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This watch used to be an access watch for the city of Rome. This system is no longer working, but this watch can still be used as snowpass watch.
Features of the chip:
- Contactless RFID* chip EM Marin, 125 kHz, P4050 V2 f/40
- Read and write memory
- Up to 4 independent applications on the chip (fire-walled)
- Data encryption
- Chip works independently from the watch battery
- Unique ID number for each watch, laser programmed and cannot be altered.
For visual checks, the ID number is engraved on the watch case bottom. | 
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 "Swatch Ponentino SKK110 - 1998 Spring Summer Collection")
