Just in case you are still searching; SyllieC (4,114) posted the manual on SCRIBD.com.
You can download it for free at http://www.scribd.com/doc/5553830/Singer-1950s-Sewing-Machine-Manual-Class-9999K
You will have to sign-up using an email account and a four letter password, but it is very quick and easy to do.

If you don't want to sign-up, I have uploaded the manual.