Rolex Vintage Swiss Oyster Perpetual Yellow Gold Red Leather Strap Women's Watch Rectangular Rolex Oyster: This refers to Rolex's patented waterproof case, introduced in 1926, which features a hermetically sealed design to protect the movement from water and dust. The watch in the image appears to have an Oyster case, given its robust and sealed appearance. Swiss Precision: This term denotes the high level of accuracy and quality associated with Swiss-made watches, a hallmark of Rolex timepieces. Rolex watches are known for their precise movements and adherence to rigorous chronometric standards, as exemplified by the Swiss Certificate of Chronometric Precision awarded to a Rolex watch in 1910. This is in great working vintage condition