MEXICO. Banco de Londres Mexico y Sud America. 20 Pesos, ND (1868-81). P-S221s. Specimen. PMG Uncirculated 62 Net. Previously Mounted.(M252s) A gorgeous blue colored specimen from a bank that now continues under the umbrella of the Banco Santander. PMG comments "Previously Mounted."PMG Uncirculated 62 Net. Previously Mounted.