slavia 610... what would it be worth ??

[niall_b73]

hi all this is my first post,
i have in my possesion 1 slavia 612 air rifle in full working order.
the link below is of the same model:

http://www.vzduchovka.cz/prehled/52000/52000_en.html

all i want to know is it worth anything only the 1 i have has the little screw adjuster on the rear sight is missing.

does anybody know what it would be worth if it is even worth anything ??

thanks for looking

niall_b73