I think based on this or a similar thread I recently ordered a pair of Dachstein mitts, dense 100% wool mittens made in Austria. I had read in some places online that these are hard to get; I didn't have much trouble. I ordered via Sweaters International, http://www.sweatersintl.com/store/woolmittens.html
They were back-ordered for a couple of weeks or perhaps a bit more but just arrived today.
I got the 7.5 size, but in retrospect wish I had sized up to an 8. Overall they fit well with a thin liner glove underneath, but the thumb area is a bit tight; I expect it will stretch out enough that it will be fine.
The size 7.5 weighs 151 grams, or 5.3 oz, i.e. their listed weights on the website are quite accurate. I also earlier bought a pair of size large Fox River double ragg "extra heavy weight" mitts; they carry these at REI. They fit about the same, i.e., overall good, a bit tight in the thumb area. They also weigh nearly the same, 163g or 5.7 oz for the Fox River mitts.
It's interesting, however, to compare the design philosophies here. The Fox River mitts have a double layer, both layers are a blend of fabrics, with the thinner inner layer being mostly a couple of synthtics. It's a much more open weave, overall slightly bulkier too. The Dachsteins are dense, and 100% wool. I expect that without a shell I would feel the wind through the Fox River mittens a lot more than I would through the Dachsteins.
I anticipate that the Dachsteins will be my go-to mitten for cold weather; looking forward to trying them out!