I have 19 and one in the works. The boys and I are trying to collect a nice drake of every species in NA. Not likely in my lifetime but maybe my boys will complete it. Our best is oldest sons 14+ year old drake black with a $100 reward band. Both bands had to be sent to USGS to be chemically etched. The reward could not be collected without the numbers which were illegible. The reward band was originally green. I guess salt water and age will do that.