Sparks, I have gun no. 84 from that run. The serial on it is EXP N
o 84, but it's much sharper and much clearer than yours. It's pre-production.
Yep, they were made right in Swissvale, PA for WWII. My grandfather was a metallurgist for US&S. This one was his. From what I've read, they're second in scarcity behind the Singer models. It's reported that they were made to tighter tolerances than other mass production M1911A1 models. This one is tight as a drum, but it never saw combat and it's only been fired a handful of times.
Don't know how much it's worth, but it's priceless to me. It won't be for sale as long as I have it.
It's classified as a curio or relic.
http://www.shelfspace.com/~c-r-ffl/sec2-a-c.html
My dad had it polished and re-blued, with gold plating on the hammer, trigger, grip safety, thumb safety, and barrel bushing. I was just a kid at the time, but I thought it was a dumb thing to do. I think it obviously would have been better to leave it all original.
I am considering having all the gold plating taken off and restoring the gun to original, sand blasting, bluing and all, but I'm not set on it yet.