SCG2661 - Poland 1965 – Tomb of the Last Mazovian Dukes, 20 GrThis Polish stamp, issued in 1965 to commemorate 700 years of Warsaw ("Siedem wiekw Warszawy"), features the tomb effigies of the last Dukes of Mazovia. Rendered in deep blue, the detailed engraving shows the sculpted figures lying atop a stone tomb. The text below reads "Nagrobek Ostatnich Ksit Mazowieckich", referencing their historical burial site. This is a 20 groszy denomination stamp, designed by Cz. Kaczmarczyk and engraved by E. Tirdiszek, and