- Code names – LYOOX (body only) 1938 Catalog + ATOOH (body only) 1946 Catalog
- LEYOO = LYOOX = + XEMOO (Xenon f=5cm 1:1.5) – 1938 Catalog
- ARHOO = ATOOH + ELMAR (Elmar (I) f=5cm 1:3.5) – 1946 Catalog
- AZOOB = ATOOH + SUMAR (Summar f=5cm 1:2) – 1946 Catalog
- Production era – 1938-1946; 32,705 cameras
- Evolution – Eyepieces are closer together to aid switching from the rangefinder to the viewing window; Dioptric correction lever changed to concentric lever around rewind knob; four-screw spring-mounted accessory shoe
- Variants – Some have added flash synchronization by Leitz; As far as known, 5 were made in black
- Body – Aluminum with chrome plated brass top plate, base plate and knobs
- Size L x W x H – 133 x 39 x 65 mm
