March '69 Dated YH Wheels

[Jeff H]

I can see where the stampings on his March YH wheels jump all over the place and most of the ones you picture seem to line up with the K 1 9 at least. Some have dashes others don't. Do you think there was a strike or something in March that resulted in no wheels being produced? I know that the Mar-Apr time frame was big for Z28 production so I would think they might have run out if they were relying on stored up reserves from Dec-Feb. Interesting.