Adam, the last patent date (on the slide plate) is September 1913. I have no idea how old my machine is -- I inherited it from my aunt -- it belonged to her grandmother (aunt is 86) or great grandmother -- I don't know for sure, but I do know that my machine has been in a climate-controlled residence for the past 50-60 years. The difference in the machine -- at a glance mine has no writing on the top side of the head where yours has the place of manufacture. I have no idea what age this machine is -- I'm just trying to get it cleaned up and refurbish or refinish the cabinet. The cabinet has been very well cared for, so it's not in bad shape.