The Victorinox Handyman knife could be a good example of model’s evolution.
Initially (in 197x) it was a 6-layer model with absolutely the same toolset as the old Champion model with only one difference – it never included long nailfile (as Champion did).
Later, Handyman was re-designed due to the availability of new tools (I mean pliers, which was released in 1986) – fish-scaler was removed, fine screwdriver also was updated to the modern shape. After 1991, multifunctional hook was added to the Handyman toolset.
P.S. The same situation is related to the Craftsman model – it also has two major editions – old (with fish-scaler) and new one (with pliers).