It may be an 840, (842?) made from ca 1970 and probably a year or two into the 80s. It's probably close to an 840 at least, but it's missing the stitch pattern selection on top. There should be a model number some where, on the inside of the column where the stitch length/width knobs are, maybe on the side under the hand wheel.
Last edited by Mickey2; 01-25-2020 at 07:10 AM.