Singers patent for the CB hook went out much earlier KlamaQuilts, you will find lots of 15 derivatives from early 1900s. Singer's model 15 is old. I have mostly seen European versions, Pfaff, Husqvarna, Gritzner,... These were gradually given a new look and new features like stitch length lever with reverse, and feed dog drop. Singer eventually did too. The noticeable thing with the Japanese post WWII clones is the stitch length lever, and they kept it identical to Singers for a long time. They added much the same features to their 15 clones you can find on the earlier European derivatives, and even went further like a tree step push buttons feed dog adjustment. The prewar Japanese clones look more like the European.
Last edited by Mickey2; 12-01-2018 at 09:09 AM.