There's a book with a title like "Pounding Out The Profits" (physical book packed away in a box) that talks about the history of power hammers, and of the various types.
Pounding out the profits: A century of American invention : the development and manufacture of crank-actuated open-die power forging hammers [Freund, Douglas] on Amazon.com. *FREE* shipping on qualifying offers. Pounding out the profits: A century of American invention : the development and...
(I'm pretty sure my copy is softbound and was cheaper - but don't know where it is right now.)
That book, or one like it, might be helpful, in that it's a catalog of these things, with some brand names, times of origin, etc.
Functionally that looks like a planishing helve hammer to me - modern devices with eqivalent function surely exist - and most likely you lot already know about at least some of them.