"1" - Aachen (government Bez. Aachen), red, S.O.T.N on extremely fine copy 3 Sgr. Black on yellow, in this stamp pad ink very scarce cancellation, photo expertize Brettl International Association for Philatelie Experts (2013) : "In fine, perfect condition. Middle natural paper inclusion. The not frequent red number postmark is clear and centric reprinted. "