I am not very good with this type of math, but, I think this may describe the combinations or variations possible with the 1902 carbine sight. (I'm not positive all of these actually occurred):

2 base variations - "C" right-side & "C" left-side.

4 eye-piece variations - '02 plain, '02 sgt. peep, '98 ground & '98 ground with sgt. peep.

3 leaf scale variations - line through numbers, line stops at numbers, and 25 yard increments.

3 leaf serration patterns - fine, coarse, and fine 'cross-hatch'.

3 locking-knob types - plain, slotted, and slotted for .30-03 case.

I reckon, there are 216 possible feature combinations, with the Krag model 1902 carbine sight.

If you throw in the rifle sight base, that would add another 108 model 1902 sight possibilities!