Raleigh sizing

16vGTI

Retro Guru
If I was looking in a late 80's Raleigh catalogue and a road bike was stated as say a 59.5, would that be c-c or c-t?
 
Thanks. I'm looking at the 1989 Lightweight catalogue & the road bikes are listed as sizes 54.5, 57, 59.5, & 62.
 
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