MEXICO. Lot of (2). El Banco Mercantil de Monterrey. 100 Pesos, ND (1900-07). P-S356p1 & S356p2. Front & Back Proof. PMG Choice Uncirculated 63 & Choice Uncirculated 64.
A duo of extremely scarce proofs for this 100 Peso design. The front proof is in a CU 63 grade, while the back proof is in a CU 64 grade. M428p.
Estimate: $1000 - $1500