I have also just sold by private sale the following rare coin of Helena:

http://www.chi-rho.com/xp532.jpg

HELE-NA  N  F
Draped bust of Helena facing right.
[Nobilissima  Femina]

Anepigraphic, Star in Wreath

RIC VII Thess. #48 (R4)
(old-'88)Sear #3909, Van Meter #2.

Chi-Rho Coins -Tom Wood