I would like to introduce myself briefly.
My name is Bernhard, I am 39 years old and come from Vienna. I have been collecting the 1850 editions of Austria and Lombardo-Veneto for about 15 years. And it's great fun.
Unfortunately, the Italian editions (1850-1858) are hardly noticed in philatelic literature in German-speaking countries. One reason why I signed up here.
And here is my first post.

In the case of the lots I bought (auction) with regard to plate defects with specimens of the 15 Centesimi on hand-made paper (Type I), I first had the impression that it must be the same plate defect on the same plate.
On closer inspection I noticed that it is plates 1 and 2.
The plate 1 differs from the plate 2 by a very clear and good print, while the plate 2 has a medium to indistinct print.
In Ferchenbauer (Volume I, 2008) I found further examples. Here is a small overview
PLF = cliché defect, Platte = Plate
Abgeschrägte rechte untere Ecke = beveled lower right corner
Einkerbung der linken Randlinie = Notch in the left margin line
beschädigtes S in "CENTES" = damaged S in CENTES
deformiertes S in "CENTES" = deformed S in CENTES
And here are the specimens from my collection.
Plate 1 - Plate 2 Plate 2 - Plate 1
Notch in the left margin line (PLF 3 - PLF 13) Plate 1 - Plate 2 Plate 2 - Plate 1
best regards
Bernhard