High Noon,
For what it is worth.....Husqvarna did make 1640/1600 action rifles with the 52cm (20.5") barrels. When they were sold in North America here (assuming the one you are looking at isn't a cut down 1640 standard) they were advertised as being 6 lbs. 6 oz. with a walnut straight comb stock, 6 lbs. 8 oz. with a walnut Monte Carlo stock. They also sold just the barreled actions as well, which were advertised as 4 lbs. 10 oz. These weights would have been with the aluminum alloy trigger guard though. I don't know how much difference that would make without stripping down some rifles and getting out the scales. I can't remember off hand what year they changed to aluminum trigger guards. I like the steel bottom metal personally for durability sake. As to the stock make and model I can't help on that one. In any event good luck with the rifle if you decide to purchase.
Regards,
sixfive
