Original old finnish Mosin civil stocks has mostly finished with linseed oil- or cellulose-based warnish which gives wood light brownish yellow tone. In my stock works I have used many years Rustins`Danish Oil. It gives wood a light tone which IMO is quite near of those original ones. This oil consist of Tung oil added with some resins and a tad of colour pigment. It penetrates good and when applied layers enough it makes very nice smooth shiny surface which gives to wood very good protection against rain and air humidity.

This puukkos handle piece has impegrated with Danish Oil. As you see the colour of the birch is very light: