Rumors on the internet* hold that Gene Roddenberry once owned a 3-foot long detailed model of the Enterprise (NCC-1701, no bloody A, B, C, or D). This beautiful work was stolen from Roddenberry's home during the 1970s. It recently surfaced on eBay with a minimum bid of $1,000.
The seller has pulled the listing from eBay and reached out to Rod Roddenberry, a son of Gene Roddenberry and director of his intellectual properties.
The model bears the mark of Richard C. Datin, Jr., the model builder for the Original Series. This model would have been used in the filming of the show.
*Note this well: I have not found any careful reporting on the subject.