Good corrosion resistance on the stainless steels is always the best choice. Both former Wenger and Victorinox used and use a good selection of stainless steel. It is a blessing to have such products.
They are easy to clean, maintain and use. The reason for why I used the green and black as an example is to write a few more words about stainless steel. Wenger and Victorinox used and use coatings and surface protection on some products depending on what
designation. This can typically be found on military MTs and SAKs designated for such use. This can be to make the surface even better against corrosion and to have an appearance less visible too. If you look upon the New Soldier 2008 type which is used by
the Swiss Military you see a knife with a regular appearance on the functions. It is a good selection of stainless steel on them. The US use one with black surface on it.
It is not just the functions on SAKs that may need extra protection. On some knives and tools it can be extra anodizing for the aluminium and coatings on such components as well.
When Wenger made the 130mm category their philosophy was to make professional
outdoors SAKs. They really made it work! Victorinox continues this legacy with some changes as you are aware about. No need to write about this I would believe.
As far as I know it is always used a good selection of stainless steel and coatings used to increase this can also have several other
factors involved. It can be for saltwater environments and for the extra wear resistance for the surface.