Got them from Miller about 5 years ago. It is an All American Paw Paw (BT130 is the catalog number).
Mine is flowering now in fact some are falling off already. Have you done pollen capture before? Can I just shake some off into a small plastic bag. Maybe cut the flower off. My tree has way too many flowers anyway. We can mail to each other I guess. I live in Hutersville, NC.