welcome to the board, great gun - a 16 - nice
a matching right hammer for any Parker may be a holy grail sort of thing
I think there are more AHEs on the market than right hammers.
it seems, and I would guess due to the right being used more often, the right is the most often lost or broken.
get the screw from Tom, for hammers - watch eBay - just don't bid against me - I need one for a lifter
if you find a matching set that works - that would be your best bet