Near as I can figure, and I am no expert or carbine collector, yours was originally manufactured between November of 1944 to January of 1945.
Whats it worth? Probably not as much as it will be in 10 years. All GI Carbines have pretty much been going up in value from day one. Winchester made ones are popular and good to own.
My Winchester in the pic cost $60.00 back in the early 1960s from the DCM and I wouldn't take $1500.00 for it today, but thats just me! Hang onto it and enjoy it, great little rifle, shoot the snot out of it.
By the way, welcome to the forum! Stick around! And by all means, please post a few pics of the new rifle, we love to see what other people have! Ken