Switzerland 1881 - Sitting Helvetia 1 Franc Gold - Zumstein No. 52 (ZSt 52) - Certified by H.W. Bossert A highly collectable and rare classical Swiss stamp, featuring the 1 Franc Gold "Sitting Helvetia" (Sitzende Helvetia), issued in 1881 on fiber paper (Faserpapier) with Control Mark Type I (broad oval). Key features of this lot: - Cancellation: Beautifully and cleanly cancelled in "ZÜRICH, -8 IV 82 XII-, FILIALE I" (8th April 1882). The expert confirms the cancellation is 100% authentic from the period of use. - Certificate Included: Comes with the original, hand-signed and stamped Certificate of Authenticity (Prüfungs-Befund/Constat Nr. 01518) issued by the prominent Swiss expert H.W. Bossert on May 23, 2001. Condition details as explicitly stated in the expert certificate: The stamp is a genuine original but has undergone professional historical restoration ("repariert"). It features two glued tears ("zwei verklebte Risse"), a corner crease ("Eckbug"), is fully backed/lined on the reverse ("ganz unterlegt") for reinforcement, and has been reperforated ("nachgezähnt"). (missing teeth) An excellent reference piece with a fully documented official expert certificate, perfect for filling a high-value gap in a classical collection. The stamp is currently loose/separated from the paper for detailed inspection. Safe and protected shipping in a rigid envelope with tracking number.