Both belong to the Classique line, the 145 bearing the addition Hommage à Frédéric Chopin to tell them apart. It is a few millimetres longer than the 144 and is thus a model in its own right. The most conspicuous outward difference is at the cap: on the 145 the first decorative ring does not sit flush with the cap opening but about three millimetres above it, and it is as wide as the third ring. More important in use is the closure: the 144 has a slip cap which no longer closes firmly the longer it is used, whereas the 145 has a screw cap.
The 145 was planned from the outset as the successor to the 144; the two deliberately ran alongside each other for some years so that dealers would not be left with devalued stock. Because the 145 clearly outstripped the 144 in numbers, the 144 was taken out of production around 2005, though at first it survived in the Solitaire versions. The 147 Traveller is unaffected by the question of size: in its dimensions it corresponds to the 146 LeGrand.