1966, 23 March. World-day of Meteorology, no’s 611-612

Design:

Overprinting:

Perforation: 13

Sheet: 30

Circulation: 30,000

 

The stamps no’s 603-604 from 1965 were used, metal-colored beam.

No.611 25Fr green-brown

No.612 60Fr gray

The series:

 

611-612-Cu1 Reversed overprint (in O.C.B.):

 

611-612-Cu2 lacking the black overprint (in O.C.B.):

 

612-Cu3 lacking the metal colored beam (not in O.C.B):

 

“Moved” overprints of no.612; straight or slanting, here are some examples:

 

611/612 Variety: after the word Mondiale there is a slash /, in some cases the slash is broken and that makes it look like an “i”: