Steve,
The serial number is entirely consistent with a 25-2 production gun.
The 25-2, according to my sources, was in production concurrently with the 25-3, 4, and 5, and possibly even the -6 and the -7.
The 25-2 was the standard .45 ACP, while the 25-3 was stamped on 2 specific guns -- a .45 3" made for Lew Horton and a .45 Colt Anniversary edition.
The 25-4 was also .45 Colt, but was the Colt Delux Anniversary version.
The 25-5 was the .45 Colt standard production variant.
The 25-2 didn't go out of production until around 1988, or possibly even later.