In the 1980s Meisterstück nibs were monocolour and not bicolour with platinum coating — this information alone, however, allows no authenticity proof. The front section of a 146 never had the shape of a 246, so corresponding photos point to a 'bastard' from parts of various models. In some auctions pictures of various pieces were also mixed, which causes confusion. A 146 with 344 nib is not known as original delivery; caution is warranted when buying such 'marriages'.