I recently was looking at some of my first bureau stamps (new color issue 1897-1903) and noticed that some of them appeared to have different heights. Below is a scan comparing the 15c to the 1c and 2c. I tried to align the bottom as best I could ... it looks as thought the design of the 1c and 2c are taller than the 15c. Is this because of the plate layouts (400 vs. 200)? Paper? I couldn't find any reference to design height differences in any of my references (Scott, Brookman, or Fragipane). Any ideas?
If there were differences, I assume the perforator settings would need to be different.