Roughly is about all anyone can do. Sako didn't build rifles in sequential order so trying to date one is difficult at best. What records we do have show rifles with serial numbers next to each other being shipped years apart & serial numbers thousands apart being shipped on the same day. Your serial number would lead me to say early to mid 1960's, but it's nothing more than a guess. Searching thru the hand written records is a tedious & time consuming task, but we are lucky to have the data we have, as Sako didn't put much importance on record keeping. If your barrel is stamped "Bofors Steel" it is 1968 or earlier.