That particular model is a favorite of mine in a fairly large collection of nice air rifles. Value is subjective, though . If it is unmodified , it's difficult to shoot and loud. Many of us prefer unmodified for reasons of poor work quality so that can be a value or not depending on outlook . The most I've seen one advertised for is $575 and I believe I've seen them in the $350 range. However , yours is a gen II and I'm not sure of the ones advertised. The early ones like that were incredibly accurate consistently .
Are you intending to sell or buy?
Bob