Here are two gorgeous porcelain haystacks. I don't know U numbers. The one on the right is more uniform in the glaze, which, when you look at the pinhole shot [id=392817102], appears to be a very dark yellowish amber color that looks more brown the heavier it gets. The iron(?) wire is attached very tightly. The piece on the left is more mottled in its glazing. Inquiries welcome.