This Large Brown Egg or Kveitekulas float comes from northern Norway.

It has an 'M' lightly embossed on the front-center of the float.  The 'M' is symetrical and shows all points of the mark.

This large brown egg was most likely used to fish for halibut many years ago.

It measures 6 1/4 inches tall and about 5 inches in diameter.

For more information, go to Tom Rizzo's blog 'The Sea Hermit' and link to the article titled "KVEITEKULAS - Halibut Egg Floats":

https://seahermit.blogspot.com/2011/12/in-mid-2000-per-einar-returned-from.html

Here's an except ...

The Raven wrote:  "The coastline of Norway, or length from south to north is about 2000 kilometers. All the big eggs are found between Bronnoysund and Trondheim. Located in the middle of Norway (a coastline of say about 300 kilometers) is the Namsos area with its historical 6 glassverks, about 1/3 of the distance from Trondheim area. The only glasswork north that made darker glass floats was Bjorum - marked B with the dott. I have one dark brown and amber from there, but the production list from 1880's doesn't say anything about Kveitekula. So the production place of these floats is still in the dark.  Schimmelmann is far south, in fact not more than 40 minutes with car from where I live. The location is wrong but the color is right. You know in 1830's they shipped with boats. That I know. So Schimmelmann Glasverk could have easily sent them north by boat for the halibut-fishermen. That would be poor speculation, but still a valid point for the blog. It is in fact easier to exclude which glassverk it can't be."