It looks OK to me, just checked my Portuguese catalogue. 1819 has round shield as do all 1820 - 1825, but 1821 and 1823 both exist with oval shield. Wouldn’t worry too much about position of lettering, these are all pretty crude strikes, and footnote to this type states “existe legenda junta e seperada”
36mm 38.4g bronze
2013 values for 1819 are F €20 VF €100 EF €250