The PIX inscription under the clip is found not only on Meisterstücks but also on many other lines like the Bohème and some Limited Editions. A complete list of affected models does not exist. The additional engravings like clip-ring number, Made in or PIX were introduced in the course of time into ongoing production, so no uniform cut-off date exists; the introduction did not occur synchronously for all models. A missing PIX is therefore alone no reliable authenticity feature.