I was looking for the exact same thing several months ago, and they were pretty hard to find. A few come through the knifemaker's market. The Tops Camp Creek is one. The marbles woodcraft is similar as is the LT Wright jessmuk. Lt used to have a knife just called "muk" that was 4 1/8" according to the knife connection but I don't think it's made anymore. I think there was one or two more out there.
If you search for skinner knives, you get a lot that are similar but not quite the same, like the buck 103, since the concept of the nessmuk is very similar to a skinner, or a small butchering knife.
This is one that I picked up off of the knife maker's market. I think the blade is 3 1/2 or 3 3/4", so not quite there but better than 3.
I also find this little guy interesting as an EDC, or little pairing knife in the kitchen. I used it frequently on small items like cleaning and chopping garlic.