6 pieces in lot. This is an important and extremely rare set of Thomas de la Rue secret marks proofs. Each is printed on thick, special proofing paper in black. All are beautifully engraved. The secret marks on each impression are circled in red and have printed explanations in the margins. All are Uncirculated and most are choice examples. The 10 Pesos back has a tear and is net graded. Rare types in any format and significant as secret marks proofs. Mixed PMG Graded Notes. From the Eldorado Collection of Colombian Paper Money.
