Sorry, I don't recognize the eagles, but I think you may have just solved it.
On my German K98K the inside to inside measurement is about 19.3 cm, although outside to outside is not much more than yours, about 20.8cm
If I average your measurements to try and get the center to center length, it comes out to 19.5, which would mean it most likely has an intermediate length action, and is a Yugoslavian M48.
The stock is correct, the bent bolt is correct, the sling slot in the butt is correct, and some were made without markings, (M48BO )
I think we have a winner.