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0-802980 is an officer's service number.Judging the color,
probably Korean War through early Vietnam. Bob

"Dittos". Bob

I wouldn't worry about it.They have been together since their first gang cleaning.Even if you found the original slide or frame I guarantee they won't match. Bob

I wonder if that is the full serial#. Ithaca?

If in the condtion you state,I think a professional appraisal
would be in order.I don't know your location,so can't recommend anyone.Some of the major auction houses
would be real interested i'm...

Amazon.com . Manual of the Automatic Pistol Caliber .45
Model of 1911
It's a nice little primer. Bob

Not sure of what your problem is but if you fire it be prepared for a full auto discharge. Bob

Not that I know of.The hard rubber would be prone to chipping,especialy around the plunger tube. Bob

If it doesn't have british proofs,it's Canadian.The Brits
Proofed everything.Your arrow marking is called the
" Canadian broad arrow".A factory letter will verify this.
It might come back shipped...