What size ball bearings for some mid 70's Campagnolo hubs

No they are small flange road hubs, but I'm not entirely sure what model, it's 35 years since I bought them.

I'm pretty sure they were not top range. They have straight handled scewers, not the curved type on the more expensive varieties.
 
Possibly Nuovo Tipo or Nuovo Gran Sport. There should be illustrations on the Velobase pages.
 
The don't look like Nouvo Tipo because they have the curved skewer levers although the actual hub could be the same. The Velobase site doesn't seem to have any records of the Gran Sport hubs.
 
Have they got an oil hole and a clip in the middle of the hub covering it up? if not then it's nuovo Tipo / Gran sport.

Straight skewers were replaced with curved skewers because the straight ones were a bit "stabby" in a crash.

Shaun
 
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