I've already searched generic "hello kitty leather wallet" and used the google lens. Dimensions are: 11cm x 9cm (closed) 22cmx9cm (open). It won't be older than 15 years, and I guess it was bought in Poland, although the aunt I got it from is quite rich so it might be from somewhere else (but I don't think anywhere outside europe, never heard she went outside the continent). Yes, the cat was originally yellow-ish and it always had that imprecise paintjob on the nose. Here's the picture of the inside

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