Hi Natalie
It appears there was an error in recording the registration material. In fact 'Double Doubloon' is from sdlg x 'Doublegood'
'Doublegood' is 'Double Value' x sdlg.
Someone from the AHS committee treemailed me thanking me for drawing the error to their attention. Also someone from NGA contacted me with the same info from a database they had.
However I just checked the AHS and NGA sites and they have not yet corrected their cultivars database. So, don't know when or if they will do so.