Don't forget the UK, where they were made. Canada and Australia got machines made in Scotland because we're all part of the commonwealth, and I don't think they ever made potted motor varieties there (I've never seen one). The later ones (from around 1953) were made of aluminium too, so very significantly lighter but same amazing stitch mechanism.

I've only seen the large hand wheels go on a few of the 15-30s or the 27s but I could be wrong.

Miriam, would the "large" hand wheel that you mentioned, describe the 6 spoked model 27 handwheel that I referred to in my previous post and thereby disqualify it from use on the 201-3 and if so...would you know which handwheel would fit on the 201?
On another note...the serial number has an EE prefix...and I wondered if that prefix could identify the machines origins or is it solely used in dating the machine?

The EE series was made in the Kilbowie plant in Clydebank, Scotland.

Try treadling with the original handwheel. I have put several machines in my MUTT treadle with their original small handwheel. They all worked just fine. You have a less area to grab on the handwheel if you are the type to start the sewing by pulling on the handwheel, but it works.

The wheel off the 27 has a deeper shaft.

Thanks Miriam and Mizkaki