I don't see the value in it regardless if it belonged to Mrs O'Connor or not but I'm not a guy who gives a hoot about who owned something before me. Just because somebody famous owned a particular item doesn't add value IMHO. It won't shoot, drive or look any better because of the previous owner. I had a very nice custom rifle in 7X57 (I called mine a 275 Rigby) built along the lines of a 1930's era Rigby stalking rifle for much less than $7500 and with scope,shells and sling it's right at 8lbs.
