I also noticed those recesses on the water table and that is also a first for me. I would have to count as some Bakers have moved on, but I think I still have 6 that are virtually all the same, except for the quantity and style of the engraving/etching. They are all B, A and a Paragon from about 1902-06. Well, there is a Leader of about the same time that is my real user gun. It seems that by the time the 2 screw bridle style came out in the lock plates, the design was pretty stablized until the Folsom models showed some other minor changes. The early ones seem to have a allot of changes until the 2 screw bridle.