Austin, Thanks for your insight.I would have thought that the factory would have just cased the whole piece. But subscribing to your school of thought and because these part's were made before the advent of true tool steel case hardening was the only avenue to toughen steel. If Parker case hardened the whole anvil it might not have been possible to draw back just the striker portion with any regularity with out creating a stress riser at the junction of the two diameters.
As far as the method to assemble these two pieces there is no easy answer. To try and swedge a soft pin to a hardened piece is not real feasible. The soft piece would have to be the part being worked and to keep it concentric after swaging would be a real trick especially in a recess as shallow as that. Pretty ingenious fellows to say the least.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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