Here is a link to some history of the very early Wheeler and Wilson # 3. Kathie sent it to me and I thought you guys would also enjoy reading this. Scroll down and read about the history of the #3 -- Wheeler and Wilson were the first to make 'round' bobbins, and according to this article the first to make 'feed dogs.' Pretty interesting!
Thank you Kathie! Enjoy!
http://silkmothsewing.blogspot.com/2...1_archive.html
Nancy