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Casio still makes many versions of the databank watch and, imo, you cant get geekier than that. https://www.casio.com/products/watches/databank

This is what I was looking for, thank you. I'm getting the DBC-32-1AES. It gives me extra nerd cred for having a model that ends with "AES".

Elliptic Curve Cryptography is the only standard I believe in :P

I totally used that watch to shut off random TVs in public places! nostalgia

Truly the Chieftain's Toy.