Rolex Oyster Perpetual 3131

**Rolex Oyster Perpetual Reference 3131** The reference 3131 represents Rolex's Oyster Perpetual model within the Bubble Back series from the 1940s. This reference features a 32mm case size, positioning it as a mid-sized offering within the Oyster Perpetual range of the period. The watch houses a 42-hour power reserve automatic movement using caliber 620. The 18k yellow gold case is fitted with a smooth bezel and acrylic crystal, providing 30-meter water resistance. The silver dial is mounted on a leather strap configuration. This reference appeals to collectors focused on 1940s Rolex production and those interested in the Bubble Back series specifically. The 32mm gold case size and automatic movement represent the technical specifications available during this production period. The reference serves collectors seeking examples from this decade of Oyster Perpetual manufacturing.