To contact company you might like to make enquiries at the following link. Contact details are provided there. I believe the company was founded in Bergen, Norway by Theodor Olsen.
I have a silver pin from my Aunt who lived in Bergen Norway, it has a stamp on it TO131/2L then under that it says Bergen (but the B looks like an upside down R) then under that the date 1874, does anyone know anything about this type on pin.
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Norwegian Marks on Silver by: Anonymous
Norwegian silver should always be marked, however I'm the first to admit it takes the tenacity of a hunting dog with some knowledge to decode the different jewelry marks that appear on Norwegian silver.
What makes it hard is because there are no city stamps or date letters on modern Norwegian silver. Early pieces are sometimes marked with the year, e.g. 1921, and/or the city such as Oslo, Christiania (the former name of Oslo until 1906), Bergen or Trondheim.
Apparently, the bigger companies started using 'Norway' and the content mark 'Sterling' after World War II. However, since this has been a question of company policy there are NO rules for this.
When the word Norway or Norge is not stated, the first clue to identification of Norwegian silver is the content mark that gives the quantity of pure silver in the piece. This usually is either 925 S (meaning 925/1000 pure silver which is equivalent to Sterling silver) or 830 S ( a quality often called 'coin silver' in the US) which means 830/1000 pure silver and is often used in the Nordic countries.
The marks you describe, might be Olsen's. Torkel Olsen was the son of silversmith Theodor Olsen, possibly a grandson of the founder. The company was founded in Bergen, Norway by Theodor Olsen in 1868 and is still going strong.
Here are two examples of Olsen's trademark for you to compare.
