3 kreuzer black on green, single franking on small superb cover from the \"Alliance fort Rastatt\" with red nummeral cancel \"115\" centric and alongside two ring cancel \"Rastatt\" likewise in red, reverse clear military cancel \"Commandeur Bad. Punishment battalion\". (side flaps missing), interesting letter especially in the connection with the attractive coloured cancellation, expertized Brettl BPP, provenance: 35. Rauhut auction 1997