The grapevine step while circling is very common in Modern Western Square
Dancing. It is even in the definition of Circle Left:
"Some regions dance 8-dancer circles with a walking step with no turning
motion of the body. Other regions dance 8-dancer circles with a grapevine
step, with the body and arms turning left and right, in synchrony with this
step, allowing the dancers to make eye contact with their Corners and
Partners successively."
Square dances and contra dances often used to be danced on the same evening.
I have no idea which style it started in, but it may well have been absorbed
from one into the other.
Happy dancing,
John
John Sweeney, Dancer, England john(a)modernjive.com 01233 625 362 & 07802
940 574
http://www.contrafusion.co.uk for Dancing in Kent