What is unique or rare about the VM Zodiac signs?

[MarcoP]

Virgo that is male and is standing, and especially if it has wings, is a reasonably good discriminator of traditional zodiacs. 

Virgo was represented as a woman. As discussed by Emilie Savage-Smith in You are not allowed to view links. Register or Login to view. p.172, in classical times, the Virgo constellation (from which the zodiac sign derives) was usually winged and holding the scales (Libra); Aratus identified her with Dike (the goddess of Justice). She was also associated with Demeter because of the ear of wheat.

While Savage-Smith focusses on classical and Islamic iconography, a brief but accurate discussion of Medieval European zodiac images can be read in You are not allowed to view links. Register or Login to view. by Colum Hourihane.

Of course, medieval zodiacs went through all types of corruptions and male Virgos could be among them.