M3131 Eyeglasses by Matsuda. Color: Antique Silver, Antique Gold, Brushed Gold, Palladium White, Size: 45-19-145. The Matsuda M3131 frame is a work of art handcrafted in the artisan eyewear workshops of Japan. With its round frame, straight temples and curved tips, this unisex frame offers both style and comfort. The Japanese acetate and metal construction ensures that the eyewear is lightweight yet durable.