BELGIUM. Royaume de Belgique Tresorerie. 50 Francs, 1966. P-139sr. Specimen Replacement. PCGS Currency Choice About New 58 PPQ.Specimen Replacement. A very high grade Specimen free of all the mounting remnants typically found on these. This is Specimen 1. A very good note to pair with the Serial Number 1 note we are also offering in this sale.