3 Sgr. Black on yellow, variety "inverted watermark", having full margins and having bright colors extremely fine copy, neat cancelled with number postmark "373" - Elberfeld (government Bez. Düsseldorf), scarce and in the catalogue value clearly undervalued variety, photo expertize Flemming BPP: "without any notices of defects" and expertise Voigt VP (2019) : "genuine and immaculate"