How much is a Weihrauch HW35 air rifle about 50 years old worth. It has not been used for decades but kept indoors?

I'm going to assume that it's in fairly good condition and working very well. I would give it $200 to $300 In Excellent condition it's worth $370 (like new) if it's the safari model add 10%, add 25% for walnut stock, add 20% for thumbhole stock, add 20% for Beeman markings. In poor condition it's worth considerably less.