Vintage Norway sterling guilloche selling clover necklace

i was pretty thrilled to find this gorgeous blue clover from Norway. it's in beautiful condition, and although i've polished off some patina there's still some, as though this was never worn. the selling back has a gold wash and is marked Norway sterling, 925S with a hallmark. the chain is also sterling with a lot of patina. enamel has no chips or scratches.

height of pendant excluding bale: 1 and 1/16"
width: just over 1"
length of chain: just shy of 18"