The correct chronology is: first presentation 1982, market launch 1983, which can also be substantiated by an entry in the Guinness Book of Records from 1983. Deviating datings like 1987 or 1988 in individual publications obviously rest on errors or sources copied from each other. The model 1497 with thread guilloche was offered until 1992 and then succeeded by the model 1499 with bicolour fishgrate pattern. Only at Pentecost 1992 was the designation Meisterstück Solitaire introduced within the framework of the New Dimensions event.