Kerryman, right you are on the guineas. I'm pretty sure I have D and F nailed as being Deeley and Facile Princeps. The grade is essentially the number (equates to price). Higher the number, higher the price (grade).
I'm still guessing hammerless for H, but I'm not positive. I find reference to an F35, but I also find separate reference to the same gun with ejectors--although it isn't noted as an FH35. Then I also find reference to several grades of DH guns, all of which have auto ejectors. So from that it would appear unclear, hammerless or ejectors.
