Judging by the apparent gap between the barrel breeches and the standing breech I would say it is quite off face and it can be somewhat costly to properly bring it back on face. That old gun has had a hard life so if you are considering shooting it and enjoying it the way your grandfather did you absolutely need to correct some issues and above all, like Jack stated, the integrity of the barrels is paramount so get it to an expert gunsmith who is well versed in Parkers.
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