Early 1911

My father gave me a service model 1911 he purchased from the Navy during WWII a number of years ago. It is a Colt and in very good appearance and operating condition. The serial #6902 and "Property of U.S. Government" is clearly stamped on it. Now, according to Colt's database, this model could be
(a) 1912 MODEL 1911 MILITARY COLT USN
(c) 1932 OFFICERS MODEL
(b) 1918 MODEL 1911 MILITARY REMINGTON USMC (it's NOT a Remington unless they used Colt's stamp)
(d) 1942 COMMANDO (I highly doubt it, but possible)
I was wondering if any one here might have any idea what it is worth. I will try to get a few pictures of it by the end of the weekend.It would help to know what angles to take pics to help determine what it is.
Also, I have a Colt 1873 Buntline Special SA (made in the late '40s, I think) #13293 SA. Some info on this would also be appreciated. Thanks.

The 1932 Officers Model and the Commando are not 1911s. The Remington UMC (Not USMC) would have different roll marks, that leaves "A" which makes sense given the history of the gun.

The gun could be worth any where from $1K to $3K depending on condition.

Looking forward to the pictures.