Yep from what I recall there is a 2 digit number next to a letter - the letter is the ring size and the 2 digits are the year of birth, so 04X (or X04, can't remember) would be a netherland dwarf born in 2004. The other letters and stuff are the breeder details.
If you can't get a good look at it, roll a piece of plasticine (sp) or blu-tak into a flat sausage shape and squish it round the ring then look at the imprint when you peel it off.