I know that this is an old thread, but readers need clarification.
All springfield frames and slides are forged in brazil. One piece barrels are made by storm lake. 2 piece are made in brazil by IMBEL.
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Springfield frames with serial numbers that start with "N" come from IMBEL (brazil) fully assembled. Frames that start with "NM" are machined, fit and finished from geneseo IL. Most will say that NM framed guns are a little nicer N framed, but there are nice and poor examples of each.
Although I am not familar with Wilson 1911s from long ago, new(er) Wilson Combat 1911s have nothing to with kimber.
Have a gander at this thread:
Where are Wilson's made? (Pics) - 1911Forum
I own a few 1911s, and Wilson Combat makes some of the nicest 1911s that money can buy.