Very rare 12k gold filled Rolex observatory wrist watch with expansion band. 

Comes with original box and certificate as seen in the photos. 

ID#: WAT162

Basic Information:

Brand: Rolex

Model: Observatory

Reference #: 500

Movement: Manual 

Weight: 43.31g

Case: 

Case Material: Top 1/20 - 12k gold filled, bottom stainless steel.

Caseback: Top 1/20 - 12k gold filled, bottom stainless steel.

Case Diameter: 25mm

Water Resistance: No

Bezel Material: Top 1/20 - 12k gold filled, bottom stainless steel.

Crystal: Sapphire crystal

Dial: Gold toned

Dial Numerals: Black Arabic numerals 

Hands: Black baton style hour and minute hands. 

Bracelet/Strap:

Bracelet Material: Top 1/20 - 12k gold filled, bottom stainless steel.

Bracelet Color: Gold 

Clasp: None - expansions band