Yes, it does seem to be an oddity. I've done quite a bit of research on 66 machines. I have 2 of 4 of my 66 identified. It started when my brother and I refurbished in 2010 the machine that my sister learned to sew on. I have a list similar to what is listed at
http://www.ismacs.net/singer_sewing_...sses-1-99.html and
Singer 66 sewing machine I'm wondering if they were trying out some new features. as frequently the "Variety" is not listed in the serial number pdfs. Also the serial number pdfs have known to have errors in them.
There was some refurbishing done in the 1940s that put crinkle finish on machines and updated some older machines. Since we are talking about a machine that is almost 80 years old, we don't know what was done to them over the course of their lives. I thought the ones with the metal Singer badges were refurbished machines, There is a 1940 machine on
http://www.sewalot.com/singer%2066.htm that has the crinkle finish and metal Singer badge.
A picture would be nice. There is a post at #8 (refers to some other links, too) about how to post a picture.
Maybe Singer was trying out some different features for the 66.
Janey - Neat people never make the exciting discoveries I do.