Papal States (Italy) 1852 1/2b deep violet Strip of 4 Cover Toscanella to Viterbo

1865 folded cover, franked with 1852 1/2b deep violet strip of four, from the upper left corner of the sheet, tied by double-circle TOSCANELLA c.d.s., to Viterbo, a scarce multiple particularly in this difficult shade, attractive and fine, signed A. Diena and G. Oliva, with 1987 Enzo Diena certificate. (Sassone 1Ab)