2 silver penny black on blue, inverted watermark "laurel wreath", properly franked single franking with postmark 741 and alongside two circle town cancel Koenigsberg on cover to Berlin, through close to the margin bond is the stamp slightly bumped, otherwise pristine. photo expertize Heinrich Wasels BPP (2026) : "stamps with inverted watermark on cover are first rarities, the small restriction should without further meaning be.