Hello again.  I now have better (much better!) photos of the rifle.  Unfortunately I did not print out this discussion so I may not have collected all the information needed to follow-up on the topics discussed above.  Unforunately there is not any internet (cell phone or otherwise) where the rifles are!

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Next time I will do the cleaning rod test to confirm the exact length of the barrel.  (External measurement shows 22 inches)

And yes, the SN's 1st number does appear to be a 3 and not 8  :-)

No "c" is stamped on the rear sight.

Once again thanks for all the information!