I was going to suggest a wood burner to sign/date your work.
While it takes a bit of practice, it is a very nice "woodworker" way to finish things.
With some work, you can actually "sign" it (not just print your name), which is classy.
Additionally, I would steer you away from the cheap "solder-stick" looking tools and suggest one with a variable temperature capability. "Colwood" and "Razortip" come to mind, and there are many others. (Mine is a Razortip)
I have only a little experience with those 'stick type' burners, but they offer no temp control. I find this most useful with different hardness of wood, and prevents over-burning or charring.
I use a burner to sign my carvings, and you certainly can get into a setup for $75 or less. A bit of searching and you can possibly find a sale or discount somewhere.
If you're interested in more info, check out Lora Irish's site (
http://www.lsirish.com/).
Just a suggestion, probably more than you cared to know, certainly worth every cent you paid for it! :bulgy-eyes:
OH, and a very nice bowl, by the way! Nice work!