Argentina
Aaron de Anchorena (1877-1965) & Balloon.
Fluorescent Ffo (strong at front, weak & dark at back). The back side is very dark under UV lamp
Fluorescent Ffo (strong at front, weak & dark at back). The back side is very dark under UV lamp
| Country: | Argentina |
| Type: | Postage stamps |
| Nominal: | 20 m$n |
| Year: | 1968 |
| Material: | National, fluorescent, horizontally grained & vertically laid |
| Size: | 37 x 27 mm |
| Perforation: | comb 13½ |
| Mintage: | 2,000,000 |
