You might know that Teletype Corp built lots of cryptographic equipment for the US military and NSA during and after WW2. Unfortunately, this stuff doesn't turn up on eBay or CraigsList.

But I was recently given the tape reader section of a TSEC/HL-1 - it is basically a M14 TD which then feeds a set of translator relays (which I don't have), which turn 5 bits to 26 letters plus some control characters.

The HL-1 translator section energizes one wire per letter which goes to a KL-7 or KL-47 rotor-based crypto machine (similar to the famous Enigma but with 8 rotors). The HL-1 essentially completes keyboard closures for each character on the tape.

The TD section that I have is shown here as well as complete HL-1 units (unfortunately not showing the translator relays)

My TD unit is evidently the TSEC/HLT-1 with connectors to a separate translator section TSEC/HLI-1 in the AN/SGA-5 system picture here -

If you have any more parts of machines like this, I'd be really interested in seeing photos.

Cheers,