Was GCA21 till 2025.
"GC" means "Geschenk/Cadeau aan Abonnees/ aux Abonnés" - Gift to subscribers. 3 categories are distinguished:
- GCA: Black and white Souvenir sheets with an imperforate copy of the real stamp. Distributed to ordinary subscribers (only stamps) or special subscribers (FDC and FDS)
- GCB: Black and white Souvenir sheet with an imperforate copy of the real stamp out of the "Anuário"
- GCD: Imperforate Stamps or Souvenir sheets whether or not in color WITHOUT number on the back. Distributed to ordinary subscribers (only stamps)
The categories GCC and GCE are, since 2025, classified under GCA and GCD
