Original gray twill 20mm wide cut from the original roll. This appears to be highly synthetic material. This webbing actually came with the original sale receipt from October 1945, so according to that it is postwar, but I believe it is equally likely wartime production being sold in the early months after the war. Sold here by the foot or an entire roll. There may be minor storage wear or light staining since it is 75+ years old and we won't know until we unroll it.
**A few of the rolls look like they have water damage, so they are available at a reduced price.