Norway mark -- maker??

Might do a CTbids auction bid (my first)... we'll see. Local jewelry sale, and just wanted to check one thing. One of the items I was looking at is a royal blue (pansy-like) flower brooch. Here is the seller's photo of the back. Obviously sterling and Norway, but does that mark on the right of the S suggest the maker? This is the only photo I have. Thanks!

(I can get a photo of the front if needed. Was just a bit complicated, it wouldn't let me "save image" and I had to go through some trouble. But did get this to copy.)

 

Bingo! That's it. Searching "Ivar Holth" I found the exact same pin.

Here's the back from the Ebay auction with your helpful ID, INH:



Thank you! Gives me a sense of value, too. This one (currently unsold) is listed BIN at $55.

https://www.ebay.com/itm/133887528178?hash=item1f2c518cf2:g:1lwAAOSwjnxhT87E