Cool finds! IMHO, they look like pretty much every brass barrel key I've ever seen. In other words I don't think there's anything regional-specific or maker-specific about them. Brass is really amenable to simply taking a piece to make a key, swaging out a head, and bam you're done (or almost-bam, then you cut a slot if you want it captured and then bam you're done). You can silver the heads, or add on silver heads if silver mounted and you want solid silver, or whatever.