DAMN! Maybe this one works?
http://news.motorbiker.org/blogs.nsf/dx/video-italian-motorcycle-police-display.htm
> http://www.liveleak.com/view?i=8f6_1216241496
from the clothing and hair styles I'd guess mid-fifties to very early 60's.
Am not savvy enough to know what vintage the bikes are.
tom k. AH#118
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I will find a way or make one.