Interesting. Any idea what the market value would be?
Slide is from a different, earlier Pistol.
Slide Release is vastly later.
Trigger is later.
Hammer is later era.
Likely other small parts are also.
Barrel, who knows? But, probably much later.
Hence, yes, it is an interesting circa 1915 Frame, with a bunch of later parts, and, an earlier ( one less patent date than it should have if circa 1915 ) Slide, all of which are Parkerized, presumably from an AA re-arsenal.
This will not have as high of value as would an intact, all-original-parts Pistol even in very low remaining original ( Blue ) finish, or, as one would which had been re-Arsenal re-finish with Parkerizing only, while remaining intact as for it's original parts being retained.
Might be a good shooter.
As Mike Faires relays above, six to eight-ish is probably a realistic value among the more informed and familiar. Might do better on Gunbroker of course, which is not really your question though, since you are looking to buy it maybe, rather than sell it.
Arsenal re-works sometimes did tend to mix parts, and or to install new Parts where-ever the old one's failed to meet spec.
Magazine and Stocks are of course from a much later era.
It looks pretty good, looks smooth, no pits or mars under the Parkerizing.