I’m unsure about any Ainsworth marks. There is the A. Kind “K” on the (unnumbered) cylinder, as well as an “H.”
I’ll check, again, for the “A” in the aforementioned places. I should add that I have scrutinized the trigger guard for an inspector’s mark, but don’t recall looking closely at the upper backstrap.
View attachment 837164
View attachment 837163
I meant any markings along the side of the cylinder, not the face of the cylinder? Not necessarily an “A”, might be an “R.A.C.”, “D.F.C.”, etc. And often a 4 digit number, the second digit of which is often in the turn line.
I’m extremely suspicious of this being a made up revolver. The numbers look suspicious. Also, when an Artillery Model revolver contains a frame, backstrap, and trigger guard with 3 and 4 digit numbers, it certainly is possible, but does raise eyebrows.
Can you post a photograph of the underside of the barrel under the ejector housing close to the frame and also the barrel address?