I do believe the very early guns all came with this style hammer. I have seen a few of these that were new in the box with the same hammer.

Dropping one of these guns hard enough to break the spur off would leave more damage on the outside, so when seeing these hammers that are on 99% guns I have to believe that they are correct. Also I would have to think that if the spur was broken of due to being dropped it would cause damage to the hammer stud and one would notice some binding in the action.

Tim