This variety has proved to be difficult.
We purchased again, this time from FGL Dahlias in Feb 2017. It is a very slow bloomer. Don't expect blooms till the end of the season, or start it early. It is not a good tuber maker, and we lost it for the second time.
ADS classifies it as:
1107 A ID DR DR5 SEN-93
1107= ADS Classification number
A= Size of Bloom, 8-10 inches in diameter
ID= Form, Informal Decorative
DR= Purple, Cultivar Color Class
DR5= Cultivar Color Description
SEN= Originator, Senior M., USA, in 1993
DR= Purple, Cultivar Color Class
DR5= Cultivar Color Description
SEN= Originator, Senior M., USA, in 1993