This is a superb classic model of IWC from the 70's with Cal. 8541. Watch is in near NEW condition, with a small nick on one lug, it was in a watchmaker's stock, never sold. Lugs are sharp, case is in extraordinary condition.
 
Make: IWC
Model: Classic 
Reference: R810AD
Year: Circa 1970's
Material: Stainless Steel
Dimensions: 35mm
Crystal: Plexi Glass
Movement: Automatic Cal. 8541
Bracelet/Strap: Leather Band (not original)
Lug Width: 18mm
Box/Papers: No