Hi Alex.
The most of the weapons that Greeks used at The Independence War at 1821 are Ottoman.You see when they won a fight they collected the weapons of the dead enemies and they used them.Anyone who had enough money remounted the blades or the daggers or the rifles by his wish usually with silver.The remounting was done by local artists and the decoration was quite the same.You can also find similar decoration at cartridge boxes.The motives was done either engraving the metal like yours or engraving and niello but with more details at the figures.I will provide to you toomorrow some pictures from swords with figures quite like yours with niello work.
Also check that cartridge box from Artzi.
http://www.oriental-arms.com/item.php?id=2171
Best
Ilias