How do you know only 300 were made? Serial number needed to date it.
Winchester never made such a weapon as you ask about.
Winchester Model 66
Your weapon needs the services of a gunsmith. You have a mechanical issue related to spring(s) and breech.
No such weapon made by Winchester
No such weapon made by Winchester.
No such weapon exists.
· Winchester rifle · words
Impossible to value any weapon with what you have provided. Could go from 10-10000 USD
No such weapon.
No such weapon.
The Winchester, named so because of the working weapon above the bar.
Impossible to value a weapon with only the serial number.