Steel & 18ct rose gold Rolex 'Bubbleback' Oyster Perpetual bracelet watch with rose dial and bezel. Made 1940

Information

• Brand: Rolex
• Made: 1940
• Model: Oyster Perpetual
• Reference: 3133
• Calibre: 9 3/4'''
• Movement: Automatic
• Material: Stainless steel & 18ct rose gold
• Features/complications: Bubble back 
• Dial: Rose dial with outer minute track featuring luminous hour indices with luminous Oyster hour and minute hands and sub-seconds dial
• Case dimensions: 32mm
• Bracelet/strap: Steel & rose gold bracelet
• Accessories: N/A
• SKU: 3368

Essay

Rolex created the auto-rotor movement from the Aegler movement in Hunter watches that featured a “perpetual motion” winding mass. Rolex subsequently patented its first successful perpetually self-winding wristwatch in 1932 and the Bubble Back was introduced in 1933 and featured the first auto-rotor.