Does anyone know anything about this firm?
All I can find out about them is that they are based in Orkney, started in 1967, and make jewellery with a Scottish theme, in silver and gold.
I have a very nice brooch in a Charles Rennie Mackintosh style, that is marked 'ORTAK Scotland' but it has no kind of hallmark that I can see, although it does look like silver.
It is cast, as most of their things appear to be, rather than hand-fashioned.
Any help appreciated.