This is a great example of the rare Zildjian 1950s Ride cymbals – identified from the small stamp, no three dots, lack of Zildjian marking, and the location of the text in the stamp.

The cymbal has some surface marking  commensurate with its age, as can be seen from the photos, and also a few very small (< 1mm) dinks in the edge (see photos).

The cymbal weighs 2075g.

It has that classic old-Zildjian ride sound and would be a great ride cymbal for someone looking for that type sound and style.