In 1889 Colt invented the worlds first double action, swing-out cylinder revolver.
This was known as the Colt New Navy.
Colt put the new revolver through a series of rapid improvements, and when the Army also bought it, the name was changed to the Colt New Army & Navy.
In 1908 Colt did the final improvements, and introduced the final perfected revolver as the Colt Army Special.
It was made from 1908 to 1927.
The Army Special was built on the medium frame size, and would be the basis of every medium framed Colt revolver made iup to the Colt Python.
Among the revolvers that were based on the Army Special were the Official Police, the various Officer's Model target revolvers, the original Trooper, and the Python.
Serial numbers for the Army Special picked up where the New Army & Navy left off, with the first Army Special numbers at 291000.
The name "Army Special" was hopeful advertising, but the Army never bought it.
So, in 1927 Colt re-named the Army Special as the Colt Official Police.
The Army Special/Official Police was made virtually unchanged from 1908 to 1969.
The Army Special was offered in bright blue or bright nickel.
Barrel lengths were 4", 4 1/2", 5", and 6".
Calibers were various now obsolete .38 caliber cartridges like the Colt .38 Short and Long, the 32-20, the .38 Special, and the .41 Colt.
Grips were originally black hard "Gutta Percha" rubber with molded in Colt logos and checkering.
Starting in 1924 grips were changed to checkered walnut with Silver Colt medallions.
The original Army Special design changed so little, many parts from a 1908 Army Special will interchange with a 2003 Colt Python.
To determine when yours was made, check the serial numbers here:
http://proofhouse.com/colt/