The Colt Model of 1905 Marine Corps Revolver was a .38 revolver

Revolver

A revolver is a repeating firearm that has a cylinder containing multiple chambers and at least one barrel for firing. The first revolver ever made was built by Elisha Collier in 1818. The percussion cap revolver was invented by Samuel Colt in 1836. This weapon became known as the Colt Paterson...

 issued by the United States Marine Corps

United States Marine Corps

The United States Marine Corps is a branch of the United States Armed Forces responsible for providing power projection from the sea, using the mobility of the United States Navy to deliver combined-arms task forces rapidly. It is one of seven uniformed services of the United States...

 during the period 1905 to 1909. It is a variation of the Colt M1892

Colt M1892

The M1892 Colt Army & Navy was the first general issue double-action with a swing-out cylinder revolver used by the U.S. military.-Overview:In 1892 the gun was adopted by the Army in .38 Long Colt caliber, and the revolver was given the appellation New Army and Navy. Initial experience with the gun...

with a rounded grip frame. A small number (less than 850) are known to have been issued under military contract. These revolvers are marked on the butt with the appropriate USMC markings and are serial numbered 001 through at least 812. A further 926 copies were made between 1905 and 1909 for the commercial (civilian) market, and these revolvers are serial numbered on the butt from 10001 through 10926.