These machines are generally referred to loosely as simply 9W machines. How ever there were sub models listed by the following number. The 9W1 &? 9W7 were the most popular, though the sub? numbers went up through around 9W12. The 1 & 7 were listed as family along with 4 other numbers 2 in both the 1 & 7 series. These were either fitted for a hand attachment or fitted with it. All were listed for Export Only. The others were primarily considered as Tailoring machines, had knee lever for lifting presser foot etc. This info is from a 1908 with handwritten corrections to 1911 Singer/Bridgeport catalog.
