In some of the WW1 cards the border of the logo is an inverted triangle rather than a shield.Some cards have B.V.i.B. printed beside the divider on the address side.
The examples show that publishers sometimes give full details and sometimes just use the logo. The first is a WW1 card posted from the front (Feldpost). Maybe the Germans required printers/publishers to be identifiable in wartime, as the French did.