The additional engraving "METAL" Montblanc, according to its own information, only uses on writing instruments of solid precious metal or stainless steel, e.g. on Solitaire models, on the Stainless Steel or on the 147 Silver ("Metal 2"). On the platinum-plated 164 this inscription is untypical and points to an exchanged clip, possibly originating from a Stainless Steel model, which was fitted by mistake in after-sales service. Laser engraving instead of stamped lettering remains a reliable authenticity feature. Ultimately only the clip with its serial number stands for the identity of the writer; replacement clips are not registered at Montblanc as complete writing instruments and are exchanged without complaint when needed.