I wouldn't consider these to be any part of any "production run". They're early, from the period while Harris and Vicente Boffo were still there, (polished round pontil marks are only found during the period Boffo was there, and are still fairly scarce).
These were being made while everything was fairly experimental, before there were any sort of official "production runs".
While the base part is made in a mould, the top is always hand finished, so can be of a completely different shape to the rest of the body - each one is unique.
They were made after Harris left, but not for terribly long.