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What exact model vespa he had on that trip, he did not specify in the book but he managed to include a lone picture of him on his wasp. Looking at the front fender, I think it's a Vespa U Model. Love that style and look! Here he is on the first page:
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He rode for 17,752 kilometers over 13 countries in six months. His adventure during those times, where there were no cell phones nor internet yet, and I dont know if the credit card has been invented by then already, was phenominal. As a modern vespa scooterist, I know how the old 6 volt-contact point electrical system of the vintage Vespas become inefficient at some point in use. Well done sir. Saludo po kami sa inyo, Manong Tony!