Since when does Montblanc use laser-engraved identification numbers on its writing instruments, and how old can a rollerball without this number be?

Montblanc writing instruments from the 1980s and before do not yet have a laser-engraved identity engraving; these numbers were only introduced about ten years ago. Rollerballs themselves, however, only exist at Montblanc since the 1970s with the model Quickpen, and the Meisterstück programme offers rollerballs only since the 1980s. A rollerball without laser-engraved number can thus quite be two to three decades old but is no really old writing instrument in the narrower sense.