Yep, that's a Colt New Service. Probably not - definately not - a 1909. That is a British Broad Arrow above a crown proof/acceptance mark. Could be Canadian issue. Colt sent many thousands of those to England and her Commonwealth nations, like Canada, during World War I. They were usually chambered for the .455 Eley cartridge. You might want to check the chamber to see if it is either .45 Colt or .455 Eley. I would guess Eley. According to the number you've listed, the gun was made in 1915. The July 4, 1905 patent date would be consistant with a New Service made in that year. The last patent date, from 1926 to the end of production in 1944, would have been October 5, 1926.

It is definately a Colt, but not a 1909.

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