These sunglasses are from the Danish luxury brand Lindberg, specifically from the Acetanium collection which combines the lightness of titanium with the aesthetics of acetate. Here are the details based on the attached photos and the data engraved on the arm: 1. Specifications Brand: Lindberg (Made in Denmark). Model: Number 8343. Materials: The front frame is made of transparent acetate, and the arms are made of high-quality titanium known for its superior durability, flexibility, and lightness (Sun Titanium). Lenses: Dark brown lenses providing Category 3 (Cat. 3) protection, very suitable for strong sunny conditions. Design: Features a modern and elegant hexagonal design, with the famous Lindberg hinges that work without screws. 2. Sizing The size is clearly engraved on the inner arm as follows: 44-23 — 150 44 mm: Width of a single lens. 23 mm: Width of the bridge (distance over the nose). 150 mm: Length of the glasses arm. These glasses are considered small to medium in size and fit slim or medium faces perfectly. 3. Estimated Price Lindberg glasses are classified as luxury eyewear and are not usually sold in regular stores, but at authorized dealers. Additional Notes: The unique serial number is also present on the arm to ensure authenticity. The glasses are hypoallergenic thanks to the use of medical titanium. Frame Material: Titanium