Having checked
DOC, I vote for
Manuel II. The two dot
sigla in the
field left of the emperor, which looks like a colon, is uncommon, but there are a few
Manuel II coins that have it, including one with 20 dots around the
obverse. This coin has 20 stars, rather than dots, though only 8 are visible because the strike was not centered. Some of Manuel’s coins have stars rather than dots.