Genuine Leica Leitz OTSRO 16472K 135mm Extension Tube for Visoflex II & III V11

Leica OTSRO extension tube, also known as Leitz 16472K. Adapter ring for 1:4/135 Hektor or Elmar 1:4,5/135 lens heads to Visoflex 2 and 3. It has a couple of very light scuff marks on its exterior, but nothing major.