The question comes from another board, and while I know that Winchester used a “H” on their more modern rimfires, the question is regarding a 56-52 Spencer case with a “H” in a depressed circle. Made by Henry, or Winchester?
Winchester, Benjamin Tyler Henry was the plant foreman, among other things at Winchester and did not maufacture ammunition on his own, but did experiment with it ca. 1858. Apparently he recoginised that the S&W .22 was already patented and his .44 production was not, however O. F. Winchester honoured him with the H headstamp, as early as when he owned New Haven Arms.
Thank you Pete, I’ll pass it on.