Maral - you certainly have a wonderful piece there!
I've always liked rifles in non-standard, rare or unusual calibres - this one certainly fits that bill nicely!
The 6.5x55 is a great round so you will have plenty of downrange punch.
It has certainly been kept rather well (to say the least)for it's age so lets hope the barrel is in similar condition.
That ringed mark on your Nickle scope, was the scope non original; I might be completely wrong here, but was the scope originally turned to match the mounts?
Regardless you have picked up a fantastic old rifle, one that can certainly be easily handed down to children or grandchildren!
Please don't forget to add in your loads when you get your new mistress home!
Well done
93x64mm