Did they say anything about the one you picked up? M70/77 in that fancy stock?
I know a lot of the Tradex pieces come from Sweden, they also used S&L rimfires in their clubs. Some weird law that you can only own 8 rifles or something, so when someone wants to acquire new, they have to dump one if they are at the limit already.
I have 8 of the M70/77 (4 of each). The nicest is a late M77, one of the last 100 they made. Came in a nice walnut stock opposed to the beech usually found on them. Oddly it's the best shooting one as well.
I think most of the TEC rifles are from Denmark, where the many Danish shooting clubs used S&L rifles. The stickers that are on many of the TEC M70/77's have Danish words on them. The stocks on the four that I've refinished have all been walnut.
Trade Ex did get one with the M88 stock last fall. It went fairly quickly.