Rolex Date 18k ref.1501 Sigma Dial de 1963

Translate this text into English and remove HTML codes: The Rolex Date reference 1500 has maintained its status for decades as a symbol of class and refinement thanks to its modest 34mm case, which makes it a more comfortable and discreet watch than the classic Datejust. The sigma dial consists of small letters at the bottom of the dial, which emerged thanks to the Association for the Industrial Promotion of Gold (APRIOR), an industry association for those who manufacture gold watches, which had a clear mission: to promote the use of gold pieces in a watch to improve the perceived intrinsic value of a traditional watch. Sigma symbols were proof that the hands and indices in a watch were made of solid gold. "A watch signed with sigma is a lasting investment," emphasized APRIOR in marketing campaigns. Brand: Rolex Model: Date Reference: 1501 Year of Manufacture: 1963 Serial Number: 9xx xxx Material: 18K gold Dimensions: 34mm Crystal Material: Plexiglass Luminous Material: Tritium Calibe