Impreso en hojas de 25 (5x5) o 50 (5x10) sellos.
Originally 6.724.600 were printed but, in 1974, 5.806.000 were surcharged.
Variedades:
- line below printer´s name (pos.26) (SFCh 804a)
- additional star over "OBSERVATORIO" (pos.46) (SFCh 804b)
- shifted perforation (SFCh 804c)
- imperforado (SFCh 804d)
