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@Scilly.Suffolk
What's going on here then? (pics are too big to embed) They're clearly C-Record cranks, which ties-in with the date code for 1993.
However, Campag didn't add groupset names to components until 1995 and only added the length of the cranks from 1996. So based on the markings these date from between 1996 and 1999.
Being 180mm long I thought they might be Speed Th or Crono. Info is scant in the catalogues but as far as I can tell, the triathlon group didn't use hidden fifth arm cranks and were marked "Speed Th".
Which leaves the TT group. From the catalogues and spares brochures, it seems that only the bar-end shifters were specific, so presumably Record components were used otherwise.
Could it be that Campag used up stocks of C-Record cranks, rather than produce the current cranks in long lengths? I don't suppose there was a huge demand for this group, which didn't justify the tooling costs. It would also explain why it features so little in the catalogues.