Probably 70 years old. Was used in my late father's garage. Not tried for at least 20 years, but it DID work all those years ago.
Outdoor cable, but surely with a few faults.
Good thing it has 3 wall-mounts to slot over a screw- anybody willing to test it out /recycle it ? If not , it goes to the tip next week.
I hope the links below work,
Trevor