Neither. This is Brazilian, made by Francisco Pereira da Fonseca of Rio de Janeiro, working at least 1864 to 1887. The "10" is the fineness of 10 dinheiros, 10/12 or .833.
Hope this helps!
Ref: Rodrigo Melo Franco de Andrade ed. As Artes Plasticas No Brasil (Rio de Janeiro, 1952) p. 258