Stev8del8, My guess is that you have an '84 manufactured frame that may've been slated as an '85 model year SR if the shifter boss location wasn't changed mid year in '84. Here's the '85 model year catalog http://vintagecannondale.com/year/1985/1985.pdf .

A problem with these very early SR frame sets is that there are just so darn few of them. Cannondale at the time was primarily a touring bike manufacturer dabbling in roadies and all terrain bikes. The third set of bottle cage screws probably point to the down tubes being used on ST and SR frames and something I was unaware of. My '86 manufactured frame doesn't have that provision.

Great find!

Brad