I bought an old converted machine today. It had been a treadle machine, converted to a "portable", in a case. Very heavy, lol. You can see where at one time it said Olson on the front, but no longer. It seems to be missing a piece that I suspect is a prong for a second spool of thread. It needs cleaning badly, but the woman I bought it from says it works, or did, last time she used it.
I can't find a serial number or year on it anywhere, and my built in flash reflects so much that the photos are terrible. I will have to get my dh to take it back outside to get a daylight photo.
I didn't get a manual, but hope to figure out how to work it. I really wish I could get it into a cabinet and out of the case, since it really makes it sit up high. I looked on the net, but could find nothing on the name Olson.