I do not think the 115 was ever made that way(with the stitch length adjuster like the 15-91 has) - and without a date - it's likely a "generic" manual and the printer got it wrong. It would be neat if the last made 115's were like the first made 15-91's -that would be a real rarity!
What does it show for the bobbin area, since that is about the only good way to tell the 15 and 115 apart.
Singer stopped producing the 115 in the mid 30's, right about the same time they came out with the 15-91 and 201. Singer manuals all have dates and this era would have been the smaller green ones. If you have something else, it's not an original manual.
Last edited by Macybaby; 02-25-2015 at 08:15 AM.