This is popular at Pittsfield, but doesn't seem to be danced in other places.
I couldn't find a video or even an official step sheet.
So here are the steps as I wrote them down:
Mexican Waltz
As Danced by Pittsfield Seniors
to the song "Mexican Wind"
1-3 Waltz forward, LRL
4-6 Waltz forward, RLR
1-3 Waltz forward, LRL
4-6 Waltz backward, RLR
1-3 Waltz box forward (forward L, side R, close L)
4-6 Waltz box back (back R, side L, close R)
1-3 Vine left with 1/2 turn to left (side L, behind R, side & turn L
4-6 Vine right (side R, behind L, side R)
Begin again