Is it a 66 then, since you have the book? They can look very much alike. The 99 is much smaller though. $10 is an excellent price for either. I got my singer 15 for $20 36 yrs ago and it has mended jeans, sewn boat seat covers, overalls, prom dresses, quilts, coats. You name it, it has sewn it! Love it! Funny, I gave it away twice, and it came back to me both times. I will NEVER ever give it away again, don't know what I was thinking. It was meant to be with me though!