Runar, a VERY interesting snap lock indeed. Took me a few moments to recall that a lot of the Sami people are in northern Norway, as I generally think of them as being in Finland.
And reading in the photo of the book, I find that the Sami people had "lasers" way before they were invented, as in "snapplaser".
It is a fascinating lock, Runar- are you going to rebuild it, or make a new one fashioned after this old one?