Up for sale is this beautiful approximately 1970s Favre-Leuba Sea Sky Chronograph
 
Case Width: 46mm Excluding the crown
 
Case Thickness: 16mm including the crystal
 
Dial: Dark blue metallic color, with orange bezel tachymeter  with red accent chronograph hand
 
Hands: Original to the watch
 
Case Material: Stainless Steel with blue bakelite bezel insert
 
Case Marks: Super Water Resistant Swiss Made – Favre-Leuba – Geneve – 20 ATU 33043 Sea Sky 210
 
Crown: Favre-Lebua logo Signed
 
Crystal Material: appears to be Mineral Crystal
 
Lug Width: 20mm
 
Band Material: Stainless Steel Links Style
 
Condition: In very good preowned condition. Most likely polished and refinished by Rolex Service Center.
 
Movement: Manual winding chronograph caliber Valjoux 72
 
Service History: Unknown
 
Extras: 
New Old Stock with case back sticker partially on
As mentioned on Hodinkee: This unusual model was first produced by Favre-Leuba in the late 1960s, and was in production through the early 1970s. It is characterized by its oversized, square, stainless-steel case, bright blue bakelite bezel, and vibrant orange chronograph hand. This watch also boasts a depth rating of 200 meters (although we don't recommend taking it swimming today), and is powered by the iconic Valjoux 72. Add a cool stainless-steel mesh bracelet and you’re in the groove.