Vintage Zildjian K ride cymbal, sporting the New Stamp (1967-1977) and 6 rivet holes (5 rivets installed).
The edge is perfect, which is rare, but there are 2 tiny cracks at the hole. They are most visible from the underside. The longest is about 1cm long. The hole is very strong still, and the cracks have not grown in the time I've owned the cymbal. They do not affect the sound. See photos.
It sounds great as a sizzle ride with the 5 rivets installed. The rivets look original, or at least very old, and I haven't had the heart to remove them to see how it sounds without, but I bet it's really nice too.