12v Diaphragm PCB mounting manufactured by STC with 180 ohm coil, 2 separate N/O contacts. Fits standard PCB pitch N/O are the in-line pins coil is the outside pins. Total length 30mm these are circa 1968.
I believe these provide low resistance contacts and are therefore suitable for audio switching.
I have a number of these please let me know if you require more than one.