Thank you for the link, much interesting reading there!.... I can find no model number on the saw anyplace! , it is a 20” and the S/N tag says it’s built by Rockwell. Looking through your link, it appears Rockwell took over in the mid 1950’s and I see no saw larger than a 16”. Also the list doesn’t go beyond 1960 so I would assume it was built post 1960. I did replace the tires on it yesterday and had sourced replacements from a vendor on EBay who matched my wheel measurements with a Rockwell model. I’m not sure when Rockwell dropped the Walker Turner name, but perhaps this saw as a prototype design for Rockwell or some like situation!.... It’s an awsome saw and I’d like to keep it that way, LOL...Try here, lots of W-T machine information. I couldn't immediately see one for 20", but having a model number would be useful in addition to the just the size.