A better shot of the stamp would be helpful. You indicate the following "This cymbal is from the early 1900's" What year are you suggesting? The arabic script is closer to the newer constantinoples. The clarity of the photo makes it hard to see whether the cymbal says Zildjian&Co or Zildjian&Cie. Also I can't make out any indication of an arched Constantinople under Zildjian. To my less than expert eye this cymbal also looks more like an old K rather than a Constantinople based just on what I can see of the stamp.

Beautiful cymbal you've got there, but it looks like there's a crack radiating form the center hole.

Good eye,"mate"!

I didn't even catch that..........

VERY typical for Turkish K's to have 1 or 2 small cracks at the bellhole...............

usually only 1-16" to 1/8" long.........this looks longer.