@Bob Tascione wrote:
I’m just guessing as I don’t have anything with me here to reference but it looks like the slot for a leather head to fit into. I don’t know if that period Comtoise used leather in the hammers or not. Maybe another member can help us. Difficult to tell the condition of the slot from the pic but it does look like it’s been altered.
I did some more research concerning the hammer and what I found is that Comtoises did not use leather at all. They normally had a full steel hammer. My guess now is that someone modified the hammer to accomodate a piece of leather to soften the sound of the strike. Comtoises are notorious for the amount of noise they make when the bell strikes.