穿孔: 线式 14; 线式 15; line 15 x 14.
Costa Rican regular issue of 1889 overprinted in black, horizontally "GUANACASTE" (20.25 x 2 mm).
Dangerous counterfeits exist.
Typographed by Waterlow & Sons, London using a plate of 100 or by Imprenta Nacional using a plate of 50.