What is it worth Feinwerkbau model 80 pistol still in wooden box?

This model 80 was made between 1977-1983. Approx 48,000 were made. It's a side lever, spring piston model. It's nice that it's still in the box but that doesn't tell me anything about the condition of the pistol. On average (in good condition) it's worth around $350. If you can tell me more then I can give you a better estimate of value. This pistol can be very expensive.