Prepaid private post envelope - violet official seal, imperial Postal service direction German East Africa\" (Morogoro) 7½ Heller violet - rare - letter (15, 5 x12, 5 cm), crease in the middle, small wrinkles, reverse adhesive residue otherwise in good condition - Michel 175.- - VU2 a (violet) is clearly less frequently than VU2 b (red)!