Nambé 601 Metal Alloy Dish Made In USA

Brand: Nambé Origin: Made in USA Number: 601 is on the dish, protective cover with paper hang tag says Style Number W170. I think the protective cover is for a different piece. (Two sided bowl). Original sticker on bottom of dish. This piece is made of a “proprietary combination of eight metals.” (Nambé) This is an older piece. Not sure how old. Has some scratching & protective cover has some soiling.