Watch List notes:

EQUATORIAL GUINEA. Copper 5000 Bipkwele Obverse Trial, ND (1980). NGC PROOF-68 Red Brown Cameo.
KMX-TS39. Diameter: 34 mm. Coat of arms obverse, "PRUEBA" on otherwise blank reverse. A flashy Proof with faint mottled toning.

After close inspection and comparison to other examples from this series, the denomination of 5000 Bipkwele would suggest that the date is 1980 rather than 1978 where the denomination would be Ekuele as indicated on the NGC insert.

Estimate: $50 - $100