I've got two new-to-me Model 66-2's. I am trying to understand the markings on each gun. As I understand it, the serial and model numbers are stamped in the frame just below the barrel (2nd photo after the photo of each gun). But what about the number stamped into the crane? (3rd photo after the photo of each gun). I am especially curious about what looks to be over-stamps. TIA, and the guns are fresh off the range so please pardon the dirt.
Gun #1
Gun #2
--shinbone