I would focus on what seems to be two proof marks on one of them. If you can identify that proof mark, you will be a lot closer to ID'ing the pistols. I almost want to say early (1860 - 1910 era) Japan or Manchuria or Siam (now called Thailand of course), but don't know enough about those countries proofs back then to have a certainty. Have you cerro cast the barrels yet to identify the caliber?
way too many proof marks for some home brew pot metal.
I could make a list of a bunch of guns i have, or "have", or wish I had. Why would one feel compelled to provide that infornation freely? Do you feel the need to show off? Is it some immature game of oneupsmanship?
On the other hand one of the proof marks looks crudely done. That implies India, Pakistan or Afghanistan in some family shop that carved in a sort of proof mark to boost sales. If so, that knocks the value down to about the going rate of scrap metal.