My granddad had an old double hammer gun of unknown origin (to me.) I remember quail hunting with my dad and his brother back in the early 60s at the farm in Foyil OK and my uncle would tote that gun with both hammers cocked. My dad always thought that was unsafe. He hunted with a Stevens Mod 311 16 ga.
Granddad also had an old British Bulldog in .44 short which I now have in my safe. Here is a stock photo. History tells us that Gen Custer carried a British Bulldog at the battle of Little Big Horn.