Many of these M28/30's were refurbished after the wars with deep bluing, and yours appears still worn from use. Nice.
This one also has the early one-piece Russian stock without the nose-cap reinforcing bolt. Somewhat uncommon. Probably not equipped with the aluminum barrel sleeve, either.
Very good transitional representative of the M28/30 design. Congrats.
The 27 in the second photo has the reinforce and the 28/30 has the sleeve. I have just sold the 27 and 28's. I'm going to keep a few for a time and hope shoot the 28/30 this week.