From Leica Wiki (English)
- Code name - XOOIM - 12521
- Production era - 1960-1967 replaced by hood 12586
- Type - Conical, tapered hood for Summilux (I) f= 5 cm 1:1.4 (originally) and also 50mm f/1.4 Summilux-M II - black with wide chrome band
- Cap - OROBA 14037, Cap used with XOOIM hood (in reverse position) on a 50mm f/1.4 Summilux-M II - Forum discussion 
- Reference - Page 106 of Dennis Laney's Leica 1984 Accessory Guide courtesy of Mike Butkus.
- Forum discussion