personally it reminds me of part of an old Electrolux Shampooer
May actually be the Bottom Plate on the Shampooer,
as That is Metal.
the Plastic plate I photograped is a Splash plate that goes over it Before the Brushes get Mounted on.
The odd part, The X's instead of Holes may mean it's just an extra Packing Piece
when shipped from Factory.
Sorry this metal one is trashed
does look close but yours could be from older or Generic Brand Shampooer
Not a shampooer plate, Jeff.
Those are known as jibs.
Yours has an appealing cut, but, without any measurements, I'm having trouble picturing it attached to a carburetor.