Genuine vs. forgeries
Genuine – perforated 14 x 13 1/2
Genuine – perforated 12 1/2
Genuine – Unperforated
reperforated at the top & bottom
reperforated on all sides
Illustration by Plácido Ramón de Torres: Album ilustrado de sellos de correo, Barcelona 1879. Torres sold illustrations to various dealers/forgers from 1864 onwards, as well as made forgeries himself.