I have several Sako rifles and the L-series (L461, L579, L61R) are some of the finest factory rifles ever produced IMO. I have an L579 243 that's a great shooter. Also, some Vixens (L461/AI in 222 and 222 mag) and a L61R 30-06. All great rifles.
Here's some info about Sako rifle lineage that I've learned over the years. I posted this on another site not too long ago.
Sako serial numbers are a disaster after 1968 and jump around pretty indiscriminately due to the different importers (Firearms International, Garcia, Stoeger).
In late 1968, Firearms International (FI) began importing Sako's until the end of 1971. Those barrels had "Firearms International, Wash. D.C." etched on the underside. All Garcia and Stoeger imports bore import marks as well.
All Sako rifles in the U.S. that came after 1968 will either have an importer's mark or will not have an importer’s mark. Those without an importers mark were usually brought into the U.S. by an individual (most frequently, a U.S. serviceman serving in Europe.)
In 1972, Garcia took over importation of Sako rifles.
In 1978, Stoeger began importing Sakos until Beretta bought controlling interest in Sako and began doing its own distribution in the U.S.
Sako rifles are distinguished as Pre-72(Pre-Garcia) or Post-72 because a major change to the Sako lineage was made in 1972.
Some of the differences from pre--72 models were:
1. No 3rd locking lug at the rear of the bolt
2. The metal was not as highly polished before bluing so the bluing was not as nice.
3. Scope base dove tails were smooth not checkered.
4. Heavier barrel contour and no Bofors stamp.
5. Heavier and less svelte stock without pistol grip cap or fixed sling mount.
Most of this matters more to collectors than shooters/hunters. You have a fine rifle that should be a very good shooter. The stock has definitely been refinished or possibly an aftermarket stock.