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Any link how that thing should look like?
So this one would be bad I assume? http://www.ebay.de/itm/Tifosi-Campag-Campagnolo-ISO-Fit-Bottom-Bracket-/111176568818?pt=LH_DefaultDomain_3&var=&hash=item19e2a3cff2
I'd avoid a true ISO as Campagnolo cranksets of this age used a proprietory taper which needs to be deeper than a true ISO. You may & may not be lucky but the cranks can come too far up the taper with the back of the crank ending up hard against the scallop at the centre-line end of the taper - often, a cracked LH crank results.
You'd probably be best off looking for a period BB. Yes, they take more servicing, not being sealed, but a correct bracket will also not be likely to damage your cranks!
Good hunting ...
Graeme