VIOOH

• Production era - 1939-1963
• Type - Universal viewfinder for the focal lengths 3.5-13.5 cm with parallax adjusting lever.
• Variants - Later models have nose thread for TUVOO addaptor for 28 mm lens (VIOAD in NY catalog); Cine version for 1.5-15 cm lenses; Gray wartime version engraved W.H. used back-to-front with a special eye-piece.
• IMARECT - NY version with beaded side casing and large back plate.
• Reference - Page 12-13 of Dennis Laney's Leica 1984 Accessory Guide courtesy of Mike Butkus