I often find a ball hidden inside the hub centers, stuck in place with grease.

But often enough, someone loses one while servicing and doesn't have a spare, so hubs sometimes get put back in service missing one ball.

And it wouldn't be out of the question that a factory worker mis-counted. They may have volume quotas to achieve, after all.

Record and Super Record were identical during the years they were both produced, both had the oil clips.