Argentina
The back side is very dark under UV lamp
| Country: | Argentina |
| Type: | Postage stamps |
| Series: | 22th Latin American Steel Congress |
| Nominal: | 1,000 $L |
| Year: | 1981 |
| Material: | fluorescent Ffo (strong at front, weak & dark at back) |
| Size: | 45 x 34 mm |
| Perforation: | comb 13½ |
| Mintage: | 1,000,000 |