Italy
Under high wavelength ultraviolet light (380 nm) the paper appears to be a blue azure colour.
| Country: | Italy |
| Type: | Postage stamps |
| Series: | Castles |
| Nominal: | 450 ₤ |
| Year: | 1988 |
| Material: | blue azure under UV light |
| Size: | 20 x 24 mm |
| Perforation: | comb 14¼ |
Castles
 Castle Arechi, Salerno 0.17$ |  Castles- Sirmione 0.16$ |  Castles - Assisi 0.15$ |  Castle Urbisaglia 0.06$ |
 Castles- Santa Severa 0.07$ |  Castles- Melfi 0.17$ |  Castles- Serralunga d'Alba 0.15$ |  Castles- Venafro 0.11$ |
 Castles- Scilla 0.58$ |  Castles- Pesaro |  Rocca di Vignola, Modena 0.05$ |  Castle Montecchio 0.18$ |