There is no national registry but typically sideways letters indicate state of origin, so chances are your bird came from Michigan. You can google green cheeked conure breeders in Michigan, and potentially track down the breeder who should be able to tell you the age of the bird based on the number. The letters are the breeder code. Another, less promising option is to start calling leg band companies. They cannot give out info without breeder consent, but some of us leave permission on file in case anyone tries to find out more about a bird that originates in our aviaries. This is particularly important to me, as my birds are all under a lease contract rather than sale, which means that if anyone sells them without my consent it is theft, so very much DO want to find out if one of my birds has been sold.
