Thanks for the suggestions.
I can clearly see the rimfire firing pin is depressed further than the center-fire pin. There is no doubt the RF pin is stuck in the firing position.
I am not sure why this happened, but I am wondering if the 2nd strike in the same position actually drove the FP into the rimfire case and stuck there?
Anyway, the problem is beyond my skill-set, so I dropped it off with a local gunsmith.
I should get it back in a few days, and we'll see if there's anything else wrong (broken springs, etc).
My Contender pistol, while it is an older one, is very lightly used and well-cared for.
This frame was originally my dads, and after his death I became the new owner.
He probably only used the pistol a few times since he bought it new.
The first time I had a problem with the firing pin being stuck was right after I brought it home from my dads house, several years ago. I guess it was gummed up or something from sitting around for years. There is no rust on the frame anywhere; dad took excellent care of his firearms.
A trip back to the factory made everything work perfectly up until last weekend.
It still looks like new and I really enjoy shooting it, especially my rimfire barrels.
Thanks again for the suggestions. I really appreciate it.
-Jim