From the 1960's this is a Zildjian 18" Thin Crash! Weighs 1,454 grams. This has no cracks or warping, but there is a large keyhole. Should not expand as long as cymbal sleeve is kept on stand. Aside from that shows normal signs of use with stick marks, fingerprints, and some oxidation. Does not have ink stamp which is cosmetic and not used in this era. Edges have rough spots/flea bites and one large chip. Still sounds nice and washy! See the pictures for more details!