Is this a Singer model 30?
 

https://www.shopgoodwill.com/Item/92995238 The serial is AD14599, and on ISMACS it shows that as a 30, from Feb 1930. But it has a potted motor, and did they really ever make industrial machines with potted motors?

I just started learning how to identify Singer models "from crappy Craigslist photos" and I've hit a brick wall on this one. Here's the blog with the ID lessons: http://vssmb.blogspot.com/2011/07/vi...g-singers.html

It is a 101. The square needle plate, potted motor and stitch length disc on bed are the identifying features. They don't have a picture of the serial number. Even if there was, they are sometimes hard to read. If you look at the AD numbers, you will note that there are 6 number digits. If the first three digits are correct, that would put it in the 10000 that were allocated June 3, 1930.

Janey - Neat people never make the exciting discoveries I do.

I asked them to send me a picture of the serial number, and I thought it was correct, but I looked more closely and there is a final 0!!! It isn't on a plate on the front, it's welded on the bottom.

I thought so. x2 I knew the serial number was in a different place but didn't remember where.

Janey - Neat people never make the exciting discoveries I do.

Industrial motors are about the size of a garbage disposal.

https://www.quiltingboard.com/member...53-621702.html

Domestic and industrial motors.