SAINT THOMAS & PRINCE. Banco Nacional de S. Tome e Principe. 50 to 1000 Dobras, 1977. P-52 to 55s. Specimens. About Uncirculated to Uncirculated.4 pieces in lot. Specimen overprints are seen on all notes. P-52 50 Dobras, P-53 100 Dobras, P-54 500 Dobras, and P-54 1000 Dobras.