If it is genuinely #15, I believe it would be too early for twist barrels. They certainly look like laminated barrels.
Jay, did you get any pictures which clearly shows the hammer? I may be able to help.

I'd really like to see the enhanced engraving on that. I can't make it out.

Can someone help me out here. I was reviewing the spring 2021 issue of Parker Pages list of interesting serial numbered guns (see attached pic). Would this number supersede something on that list or would it be it's own unique entry?

No. 15 would be it's own entry. Josh Loewensteiner maintains the "Parkers Found" compilation and as guns are found and authenticated their serial numbers and features should be sent to Josh for inclusion.





.

Edgar, these are all the pictures I received, though I am sure Keith could provide more. Keith did say that Laminated Steel is on the rib.

For the missing hammer, one thing on these back actions is that they may use different hammers than latter guns. I believe the square cut out in the hammer is bigger were it fits on the tumbler. At least that has been my experience, but someone might know more about this than me.

Here is #46 which is similar to this #15 in many respects: http://parkerguns.org/forums/showthread.php?t=23414

Very interesting early Parker. Too bad the hammer is missing but it appears to be in good condition otherwise, considering its age

A new matching hammer could be made by a skilled craftsman like Dave Fjelline.






.

Jay, did you ever replace that horrible allen-head screw with a proper one?:whistle:





.

Dean, Yes that allen screw has been replaced with a proper screw on the lifter button. I am still waiting on a few things to get this one back together, but it is much better than it is in my initial post.

On these early guns it seems there is always a hammer missing or there is a poorly made replacement hammer. I guess it is just a result of these back action Parkers being 150+ years old and being used a lot.

Or it could be the steel they used being possibly more brittle or prone to breakage.
Could be the forging process too that may have contributed to the hammers being brittle and breaking off.

Could simply have been the screw backed out.... I've had that happen to me. Screw backed out, hammer fell off and I didn't notice until I got to the next station that I was missing a hammer.





.