Montblanc Eyeglasses. Series number: MB0628. Color code: 052. Color: Tortoise. Size: 52. Lens Width: 52 mm. Lens Bridge: 19 mm. Arm Length: 145 mm. Frame Material: Acetate. Frame Color: Brown Tortoise. Lenses Type: Clear Lens. UPC/EAN code: 664689786596. Montblanc Brown Tortoise Men's Square Eyeglasses MB0628 052 52.