c.1870s German ½ Groschen cover Schwerin – Crivitz‑Goldberg Railway directorate

Original 19th‑century German postal cover, sent from Schwerin to the Grand Ducal directorate of the Crivitz–Goldberg railway (addressed to Amts‑Ingenieur Lechler). The long, narrow envelope is franked with an orange‑brown ½ Groschen “DEUTSCHER POSTBEZIRK” stamp tied by a clear circular SCHWERIN post