Ok I think I have the back clamp versus the side clamp figured out on our 66's!
Actually Billy had started figuring it out on page 1 of this forum! He said that the 66-1 and 3 were back clamps and the 66-2 was a side clamp. I couldn't find information on a 66-2?
Here goes - the 66 spanned 1902 to 1956:
The 66-1 with the Egyptian? was made from 1902 - 1906 and the Scroll (red - must be the redeye?) from 1906 - 1923 was a back clamp. These were treadles with back clamping feet.
The 66-3 a HC also back clamping
66-4 from 1923 - ? side clamping treadle
66-5 HC - side clamping
66-6 from 1921 - 31 side clamping - electric
66-8 side clamping
66-13 side clamping 1920 - ?
66-14 thru 66-24 side clamping with reverse
I found this on this site of ISMACS!
http://www.ismacs.net/singer_sewing_...sses-1-99.html
Nancy