I think there is some info missing above... and some that is wrong.

Sako never used Zavasta (sp) actions.

They did, however, use FN made Mauser actions in the 1950's before they started making their own large actions (they were making their small actions by then though).

If you take your rifle apart, I think you will find the trigger stamped Made in Finland.

Some of these rifles were imported to the USA from Finland, so it is easy to understand how there is some confusion about a rifle made in Finland using a Belgian action which was later exported to the US...

I tried to find a picture, but it is not great and looks like any other Mauser actioned rifle of the period -- it does not show the stamping or the left side of the rifle. You can, however read about Sako using FN actions HERE.

John