well I have been restoring and customizing antiques for almost 30 years and I can't think of any and I know every model made from 1930 on up. the closest would be mid to late 50s up until 1962 when in 1963 they went to unit construction. Only similarity I see is maybe the nacel included fork shrouds. and the shape of the heads were the same for many many years.the 30s into the 40s had a tank dash but not even close to what we have. those models had a girder front end and hard tail. I generalize because some models carried certain traits while others didn't. Take the 500cc for example kept the oil tank later than the 650s.

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