looking for headset ball bearings for the Campagnolo headset
I think they're 7/32", e.g. https://simplybearings.co.uk/shop/p37914/7/32-inch-Diameter-Grade-10-Hardened-52100-Chrome-Steel-Ball-Bearings/product_info.html
I have a set of Facom vernier gauges which are not the most precise.
The to upper bearings were about 4mm while the lower bearing were about 5mm.
So from what I measured I think they are 3/16" / 0.187 = 4.76mm
Record EC34 AHead? Apparently 5/32" upper and 3/16" lower. You can still get the genuine caged sets for about £15, but there's nothing wrong with using loose balls if you can be bothered with the fiddly assembly.
@Vince started
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I think they're 7/32", e.g. https://simplybearings.co.uk/shop/p37914/7/32-inch-Diameter-Grade-10-Hardened-52100-Chrome-Steel-Ball-Bearings/product_info.html