Up for sale is a rare Omega Seamaster Deville "Kleerback" using original 560 caliber. This watch was based on the mass-produced Omega Seamaster Deville KL6292 and was offered by some dealers to swap the solid case back with an exhibition case back in the day at no extra cost. The watch was made in 1966 based on the serial number.
 
• Case size: 34mm with 41mm from lug to lug.
 
• Lug width: 18mm. 
 
• Thickness: 10mm.
 
• Movement: Omega 560 caliber, a variation of the 562 and only available in the US market, limited to 3000 pieces. The movement was recently serviced and running well at +-10s/day.
 
• Condition: Original dial with a scratch at 11 o'clock and another one between 6 and 7 o'clock; other than that, the dial is in excellent condition. 14K Gold-filled case with some scratches and dings but in good condition overall. Original plexiglass with Omega logo in the middle, same thing for the case back.
 
• Accessories: No box or paper. Come with a genuine leather strap as the pictures stated and an aftermarket Omega buckle.