From Leica Wiki (English)
- Code name - IROOA - 12571
- Production era - 1959-19??
- Type - Double trigger hood for 35 & 50 mm lenses with E39 mount; black with wide chrome band; reverses with cap when not in use
- Variants - earliest engraved "Summicron-" without code word; later versions had "IROOA"; last with catalog number
- Accessories - Cap for hood in reverse position: 14042
- Reference - Page 106 of Dennis Laney's Leica 1984 Accessory Guide courtesy of Mike Butkus.
- Forum discussion