I have this cymbal with some old looking markings.I put a photo as an attachment but it pretty small due to the compression.The cymbal is an 18" crash ride with incredible sustain.Hole in the top is irregular.Two sets of markings.Both sets are not clear.TopHalf Moon with star on topMadeI_1_R_I_Lower down isarabic writing thenK ZILDJIANISTANBULmore arabic
That's an Intermediate Stamp based on Drumaholic's chronology. The writing under the crescent moon say's "MADE IN TURKEY" Both sets of "marking's" together make up the cymbals stamp which changed from period to period and allowed Drumaholic to establish a timeline for their manufacture.
Assuming there are no cracks or damage you have a cymbals with value. Probably worth several hundred dollars.
You don't sound familiar with K Zildjians which were hand made in Turkey up until the late seventies when they were acquired by the Avedis Zildjian Co in the US.At that point they became more machine finished as time went on. Instanbul K Zildjians are prized cymbals and depending on size, weight, condition, and stamp, they can be worth up to around $3000 or more.