First, I never saw a 6542 underline, but why not, since there are some 6542 Exclamation Dot.
Then, as for the period, I saw several " - " from 1960, several quartals. And now that you wrote it, some early 1964 ones... A few.
When were the " - " 6542 dials released? Do you happen to know?
Best, Amico.
Nicolas.
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