It is the Celestron wide dovetail, similar to Losmandy D plates.
Tube is about 3 years old.
I'm offering it for sale due to lack of use since I got involved with wide field dslr imaging last winter. I'd like to reiterate that this is a very good example of this type of scope - very good optics, minimal mirror shift, no scrapes/scratches, no problems of any kind.
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