Some body bound pins are Knurled on the last .05" to retain the pin after it is tapped into a hole. It holds the pin but can be tapped back out as the surface area of the peaks is minimal.

It is easy to tell that these triggers were single file cut checkering and not done by an expert. The lines are uneven and of different depth. I am a little surprised that this was acceptable to Parker on a high grade gun.

Bill, I just checked my checkered trigger with a loupe and the work is done by a cut file. The spacing and depth is extremely uniform and in a border such as the picture Bruce posted. The quality of the work is what would be expected from the factory. My photo is not the best.

The 1904 CHE 16 went back to Remington in May 1939 and was rebarreled. I suspect its Remington work on the original triggers. The triggers are sized like Meridens and not like Ilion sizes.