I have a small well represented collection of Finnishicon Mosins and have put together a small library on them. As Claven2 pointed out the SA stands for Suomi Armeji=Finnish army and the VKT=Valtion Kivaarithedas which is know known as Valmet. Could you do a full inspection of the rifle and post all the markings on it (maybe pics) and I can do a little research for you and please include the model. The model 91's have 3 versions of VKT's and there rarity ranges for a 7 to a 9 on a 10 scale depending which one you have, this is assuming it is a M91. If this is one of the other models it could be as high as a 10 on a 10 scale, I have found my Finnish guns out shoot the r\Russianicon guns by a large margin and look really cool if you like Mosins HTH-SDH