In message LJCdnZ4C7tnn_pPVnZ2dnUVZ_s_inZ2d@cpinternet, msg
writes
Check the first URL that I posted in reply to the O.P.; you will see
that this device is included in a 1986 Motorola Euro Master Selection
Guide.

Michael
You're right.. Hmm, Very old device though, and I'm trying to think
where I've seen them, could be in old Grundig or Philips television
tuners, might be worth searching around for some old television
schematics for the OP.
--
Clint Sharp