This combination of features suggest the approximate age of this sword as being from the Thirty Year War period, quite possibly Swedish in origin. It's a true military weapon, an officer's battle sword, with a simple, sturdy hilt with a thumb ring, made to withstand the travails of field wear, and with a well-made, well-tempered blade. The sword is quite tight, with no loose parts, and has developed a nice uniform patina.
Swords of this style became popular in Sweden and the Low Countries during the Thirty Year War. A very similar form of hilt was on the field sword of the Swedish Field Marshal Carl Gustav Wrangel; it also has a very large, pear-shaped pommel, scrolled grip, and a guard with balled knuckle-bow. A picture of Wrangel's sword is attached.