This is serial #1720. I purchased used from Company Seven about 2 years ago. I have used the scope on several CCD images at my website. Please search Google for my name and astrophotography for images. The scope was sent to Televue this past July for repair of a jammed focuser lock screw. The unit was repaired and had a brass locking ring added to the focuser. That makes this a unique instrument with more rigidity for astrophotography with the brass locking ring on the focuser. The unit was also collimated and the lens cleaned. There are 3 minor dings on the tube that are approximately 3cm in length and are covered by the clamshell ring. The unit also comes with a Televue Starbeam, case, screw on lens cover, clamshell ring, and original box and packaging material. No diagonal is included. The case has some weathering on the hinges that would be expected with normal use. The case is in "good" used condition. I also have a Gibraltar and Losmandy mounting rings available in a separate ad. Individuals purchasing the entire package will get preference. Asking $2000 plus shipping in US. Thanks for looking.