The good news is the stock looks solid which is often not the case with early hammer guns. Looks like the receiver was blued at some point. My suggestion is to send it to a reputable gunsmith who knows Parkers and get them to evaluate it for you. The barrels being safe is the big part. I looks like an attractive early Parker.
Oh, don't forget to join PGCA where you can learn more about it and also order a research letter. Looks like there are surviving records on 3600, so you would enjoy learning more about your gun.
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