Machine gun ? bracket/adaptor/thingie ID

Could some kind person please ID this bracket and tell me what gun it's off and what it's for please ?It's engraved 'MG 389 SA'

Thanks in advance Kevin

Some better/clearer pictures and an idea of its size/length would help. Unfortunately the drawing number doesn't help, only a NSN will assist us via the Army Ordnance people

What about material? A picture from the front end? Are the bracket bits dovetailed clamps?

SA could also be Finnish.
Chris

I was hoping the drawing number would nail it Peter :(
I will get some better pics posted but it's made from steel.

ATB KG