This access watch is a citypass for the city Berlin. In Berlin you can use this watch as a payment method for Museums, the Zoo, public transport etc. On the strap you see the Subway stops in the city Berlin. It can also be used as Snowpass. 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... 
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 "Swatch Straight-Line SKZ121 - 1999 Spring Summer Collection")
