I have two Acoustic Coupler modems. A Racal Vadic and an Anderson/Jacobson, they're early 1980's, 75/110/300/600/1200bps selectable by DIP switches. One of them

I have two Acoustic Coupler modems. A Racal Vadic and an Anderson/Jacobson, they're early 1980's, 75/110/300/600/1200bps selectable by DIP switches. One of them has an embossing of Van Jacobson's signature. Sadly I don't think I have a telephone that fits either of them anymore so I can't demo them. Outside of that I have a car from 1978 with Mechanical Fuel Injection, and some pre-1900's pyrotechnic machines.