I have a fair quantity of this unknown (to me) wood.
I gathered if from a Green House construction site about 15 years ago and recently decide to try to spin some. This wood was the bottom sections of narrow pallets that I believe came from Holland and I think was used to ship the glass.
It is quite heavy, has very little aroma and takes details really well! I know it is not Elm as I did collect some Dutch Elm at the same time. The pieces are about 3" square and between 12 and 18 inches long. They did have nails in them and as a result I have to work between the old nail holes or trim the pieces to about 2" square to use them.
Here are a couple of 'phone' photos of the mystery wood.
IMG_1090.jpgIMG_1094.jpg