Japan
1st. Tokyo-Osaka Airmail Service
| Country: | Japan |
| Type: | Postage stamps |
| Series: | Trial Airmail Flight |
| Nominal: | 3 Japanese sen |
| Year: | 1919 |
| Material: | Granite Paper |
| Size: | 21 x 26 mm |
| Perforation: | comb 13 x 13½ |
| Mintage: | 30,000 |
Trial Airmail Flight
 Airmail - Overprinted with airplane |  Airmail - Overprinted with airplane |