18 Kreuzer dark blue on thin paper, Württemberg arms, single-circle "TÜBINGEN 6 JAN 1863", minor perforation faults typical of issue but perforations far above average for this stamp, fresh colour, black expertising mark, Klaus Irtenkauf BPP photo certificate (2020): "Clean example of this rare and difficult stamp, with double cancellation and good embossing", Mi. 2.500.-