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Nice thanks for the side-by-side. Looking at that Ebay listing on the bigger screen of my computer I'm not so sure anymore. Some pics look decidedly trapezoid! Also they are earlier than I previously wrote - as far as I can see there is the "Brevetto Longhi" stamping, it's just mostly rubbed off. That makes them pre 1959 as far as I know.
So the pista rim is 19mm wide & the road is 21mm