French army postal service free of charge letter of a member of the 46. Alps hunter-division (B. C. A. ) / fieldpost number S (ecteur) P (ostal) 184 to Tourcoing (Dep. North), single circle TRESOR ET POSTES * 29 -1 21 * 184 * (OS handbook number FP1 d), fragment of an arrival postmark single circle at back, a part the envelope flap at back is absent