Scott,The hammer is not necessarily wrong. Colt used some serrated hammers. I've examined a few other Colts with the serrated hammers besides the ones I own. This one came from Chuck Clawson's collection. An actual inspection would have to be done to determine if all the wear patterns appropriately match. BTW, the information on the hammers manufactured by Gray Mfg. is in the Clawson book.
Oh, I see how this works now. You say something in a photo is definitely wrong, based on 3 pistols in your collection and what you read in a book.The hammer is a Ithaca and definitely wrong. This pistol should have a wide Colt checkered hammer based on the guns in my collection and Clawson'''...
Clawson Mentioned Gray Hammers on page 72 in the explanation of Figure 49 which were pictures of hammers. The Ithaca serrated manufactured by Wright Engineering Co. He states that they were intermixed with checkered hammers that Ithaca subcontracted from Colt in 1944 and 1945, which included hammers made by Gray Manufacturing Co. However no where in the book does he say Gray hammers were ever put in Colt Pistols. I also believe that it is problematic to believe that just because Clawson had a pistol in his collection that it would prove that the gun was correct. Many collectors own pistols that are not 100% correct. Clawson may have been one of them...