Doubloon (Span. doblon, 'double'), a gold piece, originally double the value of a pistole, formerly coined in Spain and Spanish America. Prior to 1848 it was worth 64s. 8d. The Doblon de Isabel, coined in 1848, was till 1868 equivalent to 20s. 8d.
Doubloon
Chambers's Encyclopaedia, Volume 4: Dionysius to Friction, p. 67
Source scan(s): p. 0076