Manufacturer: Nippon Kogaku (Japan Optical) Brand: NIKKOR Model Name: NIKKOR-Q Auto 1:3.5 f=13.5cm (or 135mm F3.5) Mount: Nikon F-mount (Non-Ai type) Focal Length: 13.5cm (135mm) Maximum Aperture (F-value): 1:3.5 (F3.5) Serial Number: No.723750 - Lens Diameter: Approximately 52mm Thank you for viewing. This item is being sold as part of a decluttering effort at my in-laws' house. I don't know much about cameras, so the description is based on AI. Please check the images. The case is old. This is being sold as a junk item.