Santo Domingo, Dominican Republic, Banco Central, 1 peso oro front and back proofs, ND (1947-54) Pick-60p. Central vignette of Juan Pablo Duarte, the founding father of the Dominican Republic. Choice UNC pair mounted on cardstock and with two punch hole cancellations each.
Tough to say why ABNCo printed this and the following specimen error notes given their possibly unique status.
Estimate: 150 - 225 USD