Clean it, lubricate it and stabilize the active corrosion (well oiled 0000 steel wool on an oiled blued surface).
The marks you see on the frame are production inspection marks that were applied as it was manufactured and moved from step to step. They reflect the manufacture step and gauged inspection of various workers.
You are correct. It is an "a" suffix serial number, and there were no Alphabet Commercial DWM guns in an "a" block. It went from "i" to "t" IIRC.
The "v" on the firing pin makes me wonder if it's a Swiss with a Vogelsang inspection mark. Never seen the "B G" marks like that near the trigger.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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