Yes there is a number on the base, it is our 'catalog' number, we try to log everything in the collections in to a data base, i.e. where purchased, cost, who made it (if known) and any other info we can put together about it. Then, like with this piece, if we find out who did it/when/just anything further about it, we will log that in to the data base. My memory is not what it used to be, and after awhile with several thousand pieces in all of the collections, you just can't remember who did what when or even what it cost you. So far, if I keep up entering, it works very well. The marks are usually in places that are discreet, and can be removed, in most cases at a later time. There was about 5 years that a lot of ceramic pieces came in to the collections and I was just to lazy or tired to enter them, now I am going back and trying to identify what we bought.
Jack