A reliable indication is the spelling "PHILHARMONIA OF THE NATIONS" on the rear ring; the official counterfeit notes name deviating letter forms, e.g. an "A" without crossbar, as suspicious. On the original, the free area on the cap ring is not smooth but patterned. Since counterfeits with high-quality nibs and well-imitated clips exist, the pen should in case of doubt be presented in the original to a specialist retailer or boutique; photos alone do not allow a sure judgement. Variants of the Menuhin are not known.