12 Fp-letters with contents from the time from 9.1.45 till 26.1.45 to a soldiers in the 1. Kp. Gren. Education Btl. 4 in Dilltal / circle Welun in the Reichsgau Wartheland with "back-note" (handwritten as well with stamp "postal service traffic adjusted", "to the time undeliverable", "return! / delivery not possible", return / to the time undeliverable" and "return / postal service barrier! "), legitimate condition