Hi
Some unscrupulous restorers 'chop' the old C92 frame into the shape of a CB92 and then make much more money for their efforts. C92 restored worth maybe ?2000.00, CB92 restored worth maybe ?6000.00.
It is possible you have such a chassis? If this is the case, and you wish to achieve the top value then buying a bare CB92 chassis might be the answer, a lot of work though!