Yes, I'm very sure. I found the one page flyer that I picked up in Toledo after I first posted. The front side shows some of the engines and their building in the background. The complete name is C S Precision Machinery Ltd.. They do some reproduction engines like the Eeezil (that's the way that they spelled it), Oliver Tiger, Elfin's, McCoy, E.D. Hunter, Cub Tiger and some others.
I did a lot of searching on the internet without much luck.

If you have a link for C.S. I'd aprreciate it so that I could do a comparison. Sometimes the Asians swap the initials around but the engines clearly show a "C" above the "S" on the case sides.