Finally I've got it!

Here it is

General view

Engravings

Wood

Barrels and adjusting mechanism

Sighting plane and base for scope mountings

Action view

Factory target (grids 4x4 cm)

Now we can compare this gun with a Browning C25 from here

The building quality is high (as all Brownings are) as well as all impressions of this gun.

One interesting thing. Famous Browning's barrel selector here doesn't work - there is a limiting pin (it limits movement of the selector to the left). I've removed it...