All Voltaire fountain pens bear the engraving 'xxxxx /20000'; even the pieces contained in sets are counted in this total number. The low numbers 00001 to 05000 fall on the set examples, the other numbers on the individual pieces. The individual number on the fountain pen is identical with that of the matching ballpoint in the set, so set components can be recognised by matching limitation number. The statement that sets and individual pieces are led in two separate number ranges is not correct.