The collection of the Muzeum Wisły Środkowej i Ziemi Wyszogrodzkiej (Vistula River and Wyszogród Land Museum) in Wyszogród contains hitherto unknown artefacts from the end of the Roman Period and the early phase of the Migration Period. These include: a late brooch with returned foot of Almgren VI,2 series (Fig. 2:1), fragment of a plate-headed brooch (Fig. 2:2), and a beak-shaped strap-end (Fig. 2:3), discovered at Rębowo, Płock County (Fig. 1), and a belt buckle with a thickened frame (Fig. 3) from Wyszogród, Płock County (Fig. 1). All artefacts are made of copper alloy. These forms are typical of the latest phase of the Wielbark Culture in the area of Mazovia on the right bank of the Vistula and in Podlachia. Of particular importance is the fact that they were discovered in an area that, to a large extent, has not been archaeologically explored and which – in light of the material known so far – was devoid of settlement at the end of the Roman Period and at the beginning of the Migration Period.