I understand you have 6,390 more posts than I do on this site but at 67 years old this isn't my first rodeo either. As you can see from the included picture I too have a few I've collected over the years.
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I posted what an employee that worked in the barrel department told me. This wasn't some pimple faced kid but someone with enough time with the company that he was asked to manage all sales for the retail and on line business.
To be clear, I am not saying "this one rifle" has a Shaw barrel. That would imply that it was rebarreled. It has the factory barrel and I was told it came from E.R. Shaw. Why in the world would he tell me that? He has nothing to gain by telling me that.
As far as "evidence"? If the owner was still alive I might ask him but I am not going to ask the current owners for a signed affidavit to prove it. Sorry, but that is the best I'm going to be able to do.
If you are interested in purchasing this fine Manchester made rifle please let me know.
Thanks