What does the watermark look like?

What does the watermark mark look Like?
The watermark, which is actually a countermark, can be seen on the back of untrimmed Havells and stretches across about 10 inches. The name J Whatman is often followed by the year the paper was manufactured. The name Turkey Mill appears in some countermarks, evidently alluding to the mill’s original purpose of grinding Turkey Wheat from India.