Pedigree Chart of Breakthrough, 2 Y-GYY, Michael Jefferson-Brown, England, 1965
| Nelly | |||||||
| Seedling | |||||||
| Silver Plane | |||||||
| Chinese White | |||||||
| (Silver Coin x unknown) | |||||||
| Homage | |||||||
| Silver Coin | |||||||
| Tryst | |||||||
| Armoy | |||||||
| Seedling | |||||||
| Silver Plane | |||||||
| Foggy Dew | |||||||
| Silver Coin seedling | |||||||
| Breakthrough | |||||||
| Unknown |