Savolax is a county in the central Finland, which until 1809 was part of Sweden.
This saber is not rare and definitely was produced in large quantity - many thousands.
Currently it is attributed to Savolax infantry, but I believe it was used by infantry regiments in the whole Finland and possibly in the north Sweden too. This would explain large number of produced swords.

Blade length is 67 cm, width 40-41 mm. Note thad blade has distinctive yelman