Mick, you ask if my saw is a SS350LS or SS250. I cannot find anything that indicates either of these numbers. On the saw plate, all it says is Model 40-640 and the SER # is R9413. The manual says 20" variable speed scroll saw with quickset blade changing feature. Manual is dated 8-15-91. I bought it new in 1994 and didn't hardly use until last year when I retired and started doing scrolling and portraits. Mick does this help? Ron |