Not got many currently. I've zoomed in on this one to show the details. Otherwise it's just a picture of a bike.More photos would help
Not sure what is going on here, but the frame does indeed look like an ~'83, but the Reynolds decal dates from the '89-'94 period. Judging by the surface rust the paint is original.
This is the 1984 Competition 12:
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That has a fastback cluster. The OP's doesn't.