Need help with some weird markings

[The Sailor]

Thank you all for the information. I really appreciate your time and patience with my amateur questions. Thank you Don and Marc for clarifying what was the meaning of the markings. I just got the gun today and took some extra pictures and you guys were right it is a mis match.

I plan to use it as a shooter and will try it soon.

One last question. I was wondering being mis match and then buffed plus blued, what is the value of a gun like this? Other than the sentimental value. lol

Thanks again for all of your responses.