Rather than speculate you could just wait and deal with the issues as they arise.
if it's a helicomatic hub, the balls are smaller than 1/4", but not non-standard (I vaguely remember them as being 3/16" but don't hold me to that. It's the cones that you're not likely to find, so pray that yours are OK.
The real issue if it's helicomatic is the lack of freewheel bodies, and if you don't have a freewheel I suggest you start by seeing if the hub's internals are OK, then start trying to source a freewheel before putting any dough into an unusable wheel.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.