I blew up the pic and counted them, you got the number right
Jason that is fantastic..... my goodness, 75 LPI, never even heard of a file at 75. .0133 spacing!
The fact that you "still get a little nervous" doing it is kinda reassuring to me.... you are still human! I have never hand checkered one, I salute you. I agree on the overall difficulty level. Take a trigger guard that from the factory was belt sanded thin in back, thick in the middle, and thick on one side of the vertical front, thin on the other.... with waviness and a rough finish throughout. And one can get by with that. But once you cut, insert, weld and start reshaping, you own every square millimeter and it'd better be as close to perfect as humanly possible! I think a person could go over one of yours with a caliper and optical comparitor and find.... perfection. Awesome work as always.