This is a description of a vintage watch model made in the 1960s by the Italian brand Eberhard & Co. The model is called "Scaphograf 300," and it's a professional diver's watch featuring a black gilt dial and a 43mm stainless steel case with a screw-back and a rotating bezel. The watch is equipped with the Caliber 266-123 automatic movement with a date function. It is the top-of-the-line model in the Scaphograf series, which was introduced in 1959 with waterproof capabilities of 100m and 200m initially but later upgraded to a remarkable 300m water resistance.
The distinctive black dial has the brand's logo and model name applied in an understated manner, creating a beautiful glossy effect known as "black gilt." The combination of functionality and excellent design makes this Eberhard & Co. diver's watch stand out as a remarkable timepiece. Please note that the bezel disk may not be original, but its black and blue contrast adds to the overall impactful design.