I found one that looked very similar on google. It was on a geocities site. My browser was highjacked, so I'm not going back. If you usually use Firefox, try another browser. If it gets highjacked, just make your computer restart.
I'm a novice sewing machine person. Even though I don't know for sure, the machine seems incongruous. The tension arrangement is usually seen on treadle machines. I think it used to be a treadle. It might be an early Sears model, from what little I found.
bkay
Here's the link to Google
https://www.google.com/search?q=acme+vintage+sewing+machine&tbm=isch&tbo= u&source=univ&sa=X&ved=0ahUKEwjuwLzPm6DUAhVn6YMKHV 4MD5sQsAQIJQ&biw=1600&bih=765#imgrc=XkUynSx7Nzx2nM :