Re; coil information in the serial number sequence;

I would have gotten the information on coils directly out of the parts list book that covered all 1937 Elto and Evinrude models.

There are some common parts between the Handifour and Lightfour. BUT – The cylinder block on the Handifour is unique to it and it alone.

FWIW – on the rarity scale, I would put the Handifour near the top of the list, at least as far as Elto’s are concerned. Have seen many rare Elto’s in my time, but only know of three (mebbe four) Handifours that exist, including yours.

Hope this helps eh

Best,
PM T2