caption: The image shows an old envelope with a stamp on it, addressed to Berlin, Germany, with a postmark indicating that it was sent to the city of Berlin. The postmark reads "Luxembourg, 5d, 1d, 2d, 3d, 4d, 6d, 7d, 8d, 9d, 10d, 11d, 12d, 13d, 14d, 15d, 16d, 17d, 18d, 19d, 20d, 21d, 22d, 23d, 24d, 25d, 26d, 27d, 28d, 29d, 30d, 31d, 32d, 33d, 34d, 35d, 36d, 37d, 38d, 39d, 40d, 41d, 42d, 43d, 44d, 45d, 46d, 47d, 48d, 50d, 51d, 52d, 53d, 54d, 55d, 56d, 57d, 58d, 59d, 60d, 61d, 62d, 73d, 74d, 75d, 76d, 77d, 78d, 79d, 80d, 81d, 82d, 83d, 84d, 85d, 89d, 90d, 91d, 92d, 93d, 94d, 95d, 96d, 97d, 98d, 99d, and 95d.