A modern IBM style keyboards will use expensive mechanical switches - Cherry MX or clones thereof and what is termed double shot moulded keycaps, where one color is moulded first for the lettering, and then another colours moulded around that for the key bulk.
Often designed for backlighting where the lettering is clear or translucent.
And sold as 'gaming' keyboards. Its pretty hard to get a decent doubleshot keycap mechanical keyboard that isn't garish and overpriced.
What I have is this
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Laser engraved keycaps sadly (second best after double shot) BUT so many people make doubleshot keycaps for these switches that a replacement set will not be an issue