Trans-stamp are 1 1/8" tall. Heavy Z and CO. You may have 60's stamp with those measurements.

Gary

As far as spotting factory rivets goes...seven rivets is non standard. The committee only accepts 6 or 8. That's one strike against factory drilled. Next factory drilled are evenly spaced. You say these are not so that's a second strike against factory drilled. This older post covers some of the other tests, but yours has already failed two of them.

1 3/16" height is the early 60s stamp

1 1/4" height is the late 50s small stamp.

reference: [ame]http://black.net.nz/cym2013/ZDatingZildjianCymbals.pdf[/ame]

You need to be able to measure reliably and repeatably to within 1/16" before you can play the game of stamp heights.

In order to keep the pesky stamp from varying in height depending on who is measuring it what I do is place a piece of masking tape at the very top and very bottom of the stamp. This takes a few goes of placing it and then lifting it a bit to recheck. I find this really helps when part of a stamp is missing. Once the tape is in place then you measure the distance between the edges of the tape.

The height of the stamp isn't the only thing which looks different between different eras, but until you can do photos we can't really help.

Thanks Folks,

I'm going to get that picture thing handled. The tape to measure is a good idea, and I had used the guide attached to determine it's ethnicity as a trans stamp. Definite pronounced Z and Co. I'll check those edge measurements, and hopefully have pic attached on next post.