That about right, also you might whant to state whether it was a hunter, half hunter or open, whether it is stem wound or key wound. Cracks or fissures on the enamelled faces also detract from value. Also like you say, the hallmarks, whether it be London/Birmingham/Sheffield/Chester or some other non descript place. And the date letter... (presuming of course it is a quality piece not just some modern trash) One thing you did forget of course is, does it work? (or is it for spares?)