2.9 Foerster & Barth (L/21), Pforzheim
Type 2.9.1 zinc (typical L/21 stamp)
Type 2.9.2 zinc
Type 2.9.3 zinc
Type 2.9.4 zinc
Type 2.9.6 zinc
Type 2.9.5 zinc
Type 2.9.1 zinc (atypical L/21 stamp)
Type 2.9.7 zinc
