Opole 21.7.1921 ZKr (237.12) on package card for a cash on delivery package with single franking 5 Mark red orange postage stamps issue smelting works and peace pigeon 1920 to Memel / Memel area, transit postmark single circle TILSIT 27.7.1921 at back and arrival postmark ZKr Memel 27.7.1921 on face, transport traces