Foro de Filatelia Argentina

The 1892 series had been printed in recess and to facilitate the transfer-roll overbringing of the design on the plates special target dots had been made first:


for the 3c:





for the 5c, but not always is the dot present:

1910 Commemoratives

Not only for the 1892 definitives but also for the 1910 Commemoratives series printed in recess in order to facilitate the transfer-roll overbringing of the design on the plates special target or guiding dots had been made first in the plate:

as an example for the 5c:



see also:

http://www.filateliaargentina.com.ar/fo ... 9370#p9370