Sometimes there are interesting things printed on the inside of airmail envelopes.
1. Thailand, 2. Taiwan, 3. unknown, 4. unknown, 5. Korea, 6. China (image is the Old Summer Palace ruins in Beijing) (All images from my stationery collection.)
1. Thailand, 2. Taiwan, 3. unknown, 4. unknown, 5. Korea, 6. China (image is the Old Summer Palace ruins in Beijing) (All images from my stationery collection.)