Prussian, Customs Seal, Steuer-Kontr Seal, Image & Found by Gillian Davies.
Found in Harbledown parish Nr. Canterbury, 17mm.
Eagle displayed facing right, sword in right talon globus cruciger in left // 1459, K. PR. STEUER-KONTR around
From Paul James (Flags Forum) - Prussian coat of arms, the letters "K.PR." would stand for Königreich Preußen (Kingdom of Prussia) and Steuer-Kontr[ollen] is something like "Tax Control"
From John Kristensen (Danzigman), "New found info - Plomba Podatkowa Pruska XIX wiek, translated from Polish it says - Seal Tax nineteenth century Prussian."