Hi Phil, I think you are reading the ring upside down! On the BTO rings I use, the numbers are at the bottom and the writing (return address etc).at the top. SO for me this ring is on upside down and I nearly always put them on the other way up. So the 2 numbers I can read are 89. Blackcaps take an ‘A’ size ring and for a couple of years now they have had 3 letters and 4 numbers. (My latest are AFV4_ _ _ ) So not easy to say whether it was mine without a few more digits I’m afraid. Strangely, I had a male Blackcap on my fat-ball feeders yesterday morning – the first time ever!