The problem with your hammer is that some dick head has tried to open the action lever while the hammer was on full cock, this breaks the web at the back and elongates the hole.
The fix is fairly simple, as there is plenty of meat above, below and in front of the break use a hardwood dowel in the top curve and a brass plate behind the full cock notch and squeeze it back together in a good metal vice, it will rebound a little bit ( could tig it if you wanted to ) this will let the half and full cock engage ok and be perfectly safe it wont pull apart again.
I have done this myself and it works, I used a metal bolt on top which left a slight mark on the hammer curve, so I suggest a good hard wood dowel.
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