Crotalus,
Looks like your pistol cleaned up pretty nicely.
The serial number without suffix is proper for the left receiver.
The c/N on the breechblock indicates proofing for Nitro powder. This is a civilian proof mark, one would expect the proof on this pistol to be an eagle, similar to the one at the right of the receiver proofs or atop the barrel. When you take this gun apart, look for a serial number directly below the c/N on the breechblock.
--Dwight
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