Jack some info I posted a while ago:
>From 4/15/2006
#66 Campione Del Mondo the deepest bend, pretty constant radius as seen from the side.
#63 also Campione Del Mondo, similar to #66 about 12mm less drop, therefore a slightly tighter radius. 350mm of drop approx, measured center to center.
>From 5/15/2006
Greg is correct , back then double crest bars without the model identifier were most likely #65 or #67. I did have a pair of #63's that were stamped that way. During this period the bars also had a model number stamped at one end. Often this was cut off by the user/ mechanic. For styling or "light weight" purposes.
Always easiest to search the archives when all you do not remember is the date. This might help a bit.
John Jorgensen
Torrance Ca USA