I am sure that is authentic as that stylized T is famous and I am sure I have seen it on a Tommasinis but not on a flat topped crown but on an internally lugged sloping crown as shown below. I have seen that T on a flat topped crowns but they had a sort of a crown fashioned around the T and I believe were late '70s. I know in the 80s I have seen other Ts that were more like script Ts, not block letter Ts.
You might try dating the Campagnolo components or hope T-Mar checks in.
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