Have you looked at the tailstock end of the bed for a set of stamped letters and numbers? Will be on the top side of the bed between the ways for the tailstock and carriage. That will help with identification. The letters should identify model, type of drive, and whether it was on a cabinet or legs. Depending on when it was made could be a model K or L. Also, how wide is the bed? I think the K series had an 8 inch wide bed while the L series was 7 inches wide. I'm still learning about Sheldons myself (I have an 11" S series with the same type of QCGB) so I may be wrong about the width. :-) Anyhow, nice to see more Sheldon videos out there. Looking forward to more.