Hi, just ran across this revived thread and am posting the info for my 'little pumpkin' C-5. Its Serial No. is 3307 2 or 3rd Qtr. of 1972 as i read your guide.
I acquired it from friends a year or more ago and had it cleaned by Cathi Havens at S&S Optika here in Denver, CO. The corrector had a thick 'fog' on it, probably from the original foam that deteriorated in the case it was stored in. Other than that its in good shape and the paint still has a 'sticky feel' to it, peculiar tot he paint used on early models. Cathi told me she thought it was a very early model from the serial no. and was probably sold by them originally, although there is no original owner info. It has all the accessories + wedge, but no tripod. My friends bought it used from S&S over 10 years ago. S&S is the 2nd oldest Celestron dealer and will be closing their doors and retiring after 43 years this Sat. Oct. 31. We are losing a major resource for these classic scopes.
One question - is there supposed to be a cover plate for the base on these? On this one the motors are exposed with no covering. thanks. Ron