From the 19300's this is a Zildjian 13" Hi Hat Top! 478g, thin weight. A warm, responsive cymbal suitable for lower volume playing. Crisp.
This cymbal is looking excellent overall, with little patina or dirt. However, due to the thin nature of the cymbal, there are a few small dimples along the edge. No cracks seem to be forming from this, however, so it is safe to play! Get it while you can.