The price of $550 is more than fair if its on great condition. I will caution you as to something that has been discussed over and over. The chamber throats on the pinned barrelled 25's
was known for having 454 chamber throats while the cartridges commonly shot are 452.Only a caliper can ascertain this measurement. The later non-pinned barreled 25's had .452
chamber throats which yielded better accuracy. You can always
buy it and turn it for profit if it doesnt shoot well for you

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Gun Control= Using Both Hands