Laurin mark came in 34. The observers badge 35. So this ring is for sure post januar 1935.
Sorry, Odal, but you misunderstood me. I was referring to two different types of "835F. * Ln ". The mark that is above can only be viewed through the magnifying glass, the mark that is below is clearly visible to the naked eye. The mark below, I think of an earlier period IMO.
