1961, May. Independence series with overprint “Conférence Coquilhatville avril-mai 1961”. No’s 420-429.

Original series: 1960, 30 June. Independence. No’s 372-381

Design:

Paper: with silk tread

Printer: Helio Couvoisier, s.a., Switzerland

Overprint in black: no’s 420, 421, 423, 424, 425, 428.

Overprint in red: no’s 422, 426, 427, 429.

Perforation: 11,5

Sheet: 100

Circulation:

 

No.420            20c. Brown (no.372).

No.421 50c. Red (no.373).

No.422 1Fr. Green (no.374). Overprint in red

No.423 1,50Fr. Brown, darker as no 420 (no.375).

No.424 2Fr. Pink (no.376)

No.425 3,50Fr. Lilac (no.377)

No.426 5Fr. Light blue (no.378)

No.427 6,50Fr. Gray (no.379)

No.428 10Fr. Orange (no.380)

No.429 20Fr. Blue (381)

 

The series:

 

Reversed overprint, the series:

 

Overprint in black instead of red no’s 422 & 426:

 

Recto-verso print (no.422):

 

“Moved” overprints, straight or slanting:

 

Double overprint, I never saw an overprint that was very clear, therefore I think that this double overprint was not deliberately made for collectors:

 

In several stamps you can find a small ink spot just above the c of the word “Independence”:

 

An example of a folded sheet that was overprinted: