In the coin cabinet of the museum of cultural history, you can see a coin with the tetragrammaton, similar to the one you see at the coin museum in Kongsberg.
In the castle church at Akershus
fortress, downtown Oslo, you can clearly see the
tetragrammaton with Hebrew vowel pointing - YeHoWaH. The interior is
dated to 1750 CE.
(Click on the pictures to enlarge)