[img]http://photos.imageevent.com/drumaholic/kerope/Copy%20of%2018%20ADS.jpg[/img]
This one has been stamped with two separate dies, each one from a different era; and both large stamps.
[img]http://photos.imageevent.com/drumaholic/kerope/websize/18%20TM%20combo.jpg[/img]
It's rare but not unheard of for 2 identical stamps to be found on a cymbal perhaps do to an incomplete take on the first try. But 2 stamps which are both perfectly good, and of different types is even more rare than that.