I have a Shimano Hyperglide 8 speed cassette, 12-23, that I want to sell. There are no identifying marks on it. I checked with the Sheldon Brown website and they said that some hyperglide cassettes had plastic spacers while the Dura-Ace cassettes had aluminum ones.
Mine has either aluminum or steel spacers. My cassette has rivets holding the cluster together. There is a thin flexible washer on the lock ring.
Any idea what cassette this is?