A genuine leather hand strap by Leitz, model TROOV, introduced in 1938. It dates back to the era of the Leica IIIa and features a large tripod screw.
There is no Leitz logo found anywhere on it, and most were likely discarded over time, making this strap quite rare today.
As expected from a genuine Leitz product, the quality of the tripod screw, snap fastener, and leather is outstanding. The leather shows signs of age-related wear, but it is still fully usable.
A rare item.