Thank you Dave, for share this very interesting document. It will give me hours of reading.
I forgot that Laidley variant, but after checking my references I found this patent in the Bartlett-Gallatin book:
Here is showed that Laidley’s patent also claims exposed primers combined with his large anvils resting in the bullet. So, it is possible that he also tried the external cap with his own bar anvil system.
Indeed the Hoyem’s CFR 57(c.) and CFR 59(l.) cartridges are the same #339 and #340 because they have just this numbers overprinted in the Hoyem’s pictures¡¡
Really Fede, after reading yours sugestions I think is possible that it could be an improvised reload system because, as dave said, the crimps near the rim may be the original bar anvil crimps. Although is too much of a coincidence that the old and new crimps are perfect overlaid…
Until more information show up, I will label it in my collection as .50-70 Carlista bar anvil, that is a cool name for the spanish collectors.
Thanks to all for your help and best regards