The earliest meter reported is from 1980.
1. Hasler "F88" (MV). [Extremely rare, value unknown]
- Upright frank with straight single-line border.
- “CORREOS” in top panel, “EKUELE” and “GUINEA ECUA.” in two panels at bottom.
- TM: DC raised with boxed 4-digit S# below
- V/F: ∆ 000.oo