Unknown Big Pink 7 Pin Part

I recently got a bunch of these parts from a auction but have no idea what they are.
They are about the size of my fist
Pink and metal
7 pin - circular pattern
Not sure but may be foreign

Any idea what it could be will be helpful!


More pics

Unfortunately I wasn’t able to find anything similar to it in our catalog or from searching online. The only hit I got from the markings on the part is the RY-746 or RY-745 which comes back to a series of relays, but they are a much different form.

@Hunott20, it’s a power amplifier, one of our technicians studying Russian, was able to find this:


and here is the datasheet: