There are two type of the Portugal 20 Escudos KM #634
https://en.numista.com/catalogue/pieces1243.html
Mentioned now are the KM #634.1
The other type KM #634.2: "Larger shield divides date with larger value below", with tjhe following dates:
1998 Proof
1998
1999
2000
Portugal 20 Escudos KM #634
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