I can tell you this, the value of your Parker pales in comparison to your Beesley. Beesley was a high end English gun, often linked to the Purdy name. I read that it was recently "resurrected" and now made again in England. In 20 ga, that is quite a nice gun.
Post some more pictures of both. There are those here who are quite knowledgeable and may chime in.
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"How kind it is that most of us will never know when we have fired our last shot"--Nash Buckingham
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