Unofficially approved Soviet Russian envelope with an oblique overprint "LUGA", overstamped with Pleskau Mi. No. 10 y and franked with Pleskau Mi. No. 9, overfranked registered letter, cancelled with the stamp "PCKOB * K * -2 3 42" and "PCKOB * a * -2 3 42", flawless, examined by Krischke, photographic finding by Robert Brunel VP (2025), "The condition is impeccable."