Interesting once Ash received the pickups, he informed me that they turned out to be manufactured by Schaller, which was very common at the time. This was due to the fact that Hofner couldn't keep up with demand, so used to use Schaller for parts as their factory was just down the road.
What made rewinding these pickups awkward to work on, is they were riveted together. This made them impossible to rewind the conventional way, and Ash had to make a special jig to rewind them to original specification. You can find more about the amazing work Ash does here: www.oilcitypickups.co.uk