It's one of those self-inking stamps (where the type is pressed against an ink pad inside and flips over onto the workpiece when you press it down) where the type consists of individual rubber letters/digits. Personalised advertising may be considered a “sale” or “sharing” of information under California and other state privacy laws, and you may have a right to opt out. You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice. You can see Stephen Fry playing with one of these Outfits early on in his Gutenberg film, which you can see here.

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I have to confess I was better at losing the bits than I was at printing anything and rather quickly lost interest.Nostalgia Central has a little post about the toy, introduced by a photo showing the wooden stamper.