Alan,
That is a magnificent Sunshine Harvester and as such very much part of the Massey scene. Malcolm and I came across one in vey good condition outside at a museum in Manitoba some years ago. We were able to get good shots of it. I sat in the driving seat. Men must have been men in those days to survive a day in that driving position!
Here is a spanner you may not yet be aware of - I have just picked it up. I suspect that it is early MHF era given the numbering system on it which I believe came in at that time. Mmaybe someone can teel us more about the date an origins of this parts numbering system.
It is 1 inch x 15/16ths. I had never seen one like it before and it is marked:
M-H 625.529 M1