No, the 1917 has the earlier style that does not have the "ear" and a modern hand can be fitted. The Brazilian contract guns that were made in 1937 have the style with the "ear" and are very, very hard to find. If your gun is a 1917 and not one of the Braxilian contract guns, it is likely that a modern oversize hand will correct the timing issue.

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S&WCA 1729