Yep it is a Singer 99, and its a really nice one at that!! It uses the Class 66 bobbins and the 15x1 needles I will PM you a link to the manual for it. Or if you want I can email you the parts list and owners manual for the machine. I carry everything you could ever want for this machine and it is is stock right now.
I added this to the Virtual Section so if you want to subscribe the the Vintage Sewing machine VS go to the user defined area and subscribe to it and you will see the section on the main page of the forum.
You will really enjoy the machine and I am so glad that you posted the photos of it!
BIlly