Argentina
Fluorescent Ff (strong at front, weak at back). The back side is dark under UV lamp
| Country: | Argentina |
| Type: | Postage stamps |
| Series: | Air Mail |
| Nominal: | 20 m$n |
| Year: | 1969 |
| Material: | National, chalky, fluorescent, vertically laid |
| Size: | 37 x 27 mm |
| Perforation: | comb 13½ |
| Mintage: | 2,000,000 |
Air Mail
