Vintage Cartier Bracelet Tubogas 18k Gold Stainless SteelA vintage Cartier bracelet in the classic Tubogas style, made from 18k gold and stainless steel. Tubogas is a flexible coil design known for its distinctive look and smooth, continuous form. The signature ribbed structure allows the bracelet to expand slightly for a comfortable fit. The Tubogas technique was inspired by industrial gas pipes used in the early 20th century. Jewelers developed a method of wrapping metal strips tightly around a core