Masunaga 011 c19

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Color: Solid black acetate with a subtle glossy finish
Size: 53–20–150 B = 42 mm ED = 53 mm
Material: Full acetate

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The Masunaga 011 C19 is a sleek square frame crafted from glossy black acetate. It features a classic silhouette with clean edges and a slightly rounded square shape. The frame includes a subtle keyhole bridge and matching acetate temples for a refined and comfortable fit, perfect for both professional and casual styles.

All sizing is listed in millimetres (mm) and follows the same convention.

The first number is the A measurement, or the widest width of the lens, regardless of the plastic or metal around it. It’s strictly the lens.

The second number is the smallest distance between lenses, or DBL. This is commonly referred to as the bridge.

The last number is the length of the temple itself. Extra measurements given are the B measurement, which measures the largest vertical depth of the frame and the ED, or effective diameter, which measures the widest straight line you can make on the frame. Oftentimes this is the same as the A measurement. Like the A measurement, both the B and ED are strictly measurements of the lens and not the plastic or metal surrounding the frame. 

For example,

54-18-135, B=38, ED=56

- This frame’s widest horizontal measurement is 54 mm.

- The bridge is 18 mm and the temple length is 135 mm.

- The deepest portion of the lens is 38 mm

- The widest straight line you can make on it is 56 mm