OTXBO

• Production era - 1960-1983
• Code numbers - 16460 16716 16499
• Type - Four x magnifying right-angle prism eyepiece for Visoflex
• Variants
  • With step (at left) for Visoflex I /II
  • Without step (Item 16499 at right) for Visoflex III
• Source
  • Dennis Laney's Leica Accessory Guide (1st edition) page 49 & 51 courtesy of Mike Butkus
• Forum discussion
  • [1]