Best estimate is that this is a 1961 brochure. The 1200 Spyder was restyled in 1959 and lasted until approximately 1961-1962. Wikipedia says that the 1100D wasn't introduced until 1962 but the 1200 Spyder would have been upgraded to 1500 that year. The 600 lasted until 1968 but was likely pulled from the USA before then.
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