Machodoc
Old Guy
It means Colt Model 1911 production contract 84. You'll probably have to verify with Colt if contract 84 is Argentina. It should be, since the commercial serial number falls within the correct range for one of the Argentine production runs.
Boom Boom - Can you source that info for me? Is that in Clawson or another work, or is there an internet resource for it?
I'll probably eventually end up popping for $100 to get a letter on this one, but realize that it's not worth it from the average collector's standpoint. For me, though, figuring out the history of an interesting piece is part of the fun, and it would be as enjoyable to me to get that letter (if it reveals anything of interest) as spending the same amount taking the wife out to dinner ... but don't tell her that!
First, though, I want to see what I can find out here and online, and I want to look inside the gun and take more pics.