Watch List notes:

Koninkrijk NL Juliana (1948-1980) - 2½ Gulden 1980 countermarked on the obverse 'VALS / KPK' (vdWis -) - Fits with ideas at the former Koninklijk Penningkabinet to make counterfeit coins 'harmless' by countermarking; probably a trial mark (the coin is genuine) - Interesting !