Watered means that the piece is damascus steel. Meaning it is a mixture of steel and iron and will show a pattern. As heavy as that barrel is I think it is possible. The contrast of the pattern is brought out by acid being used on the piece. People mainly use ferricc chloride now but just about everything under the sun has been used including urine.
regarding the barrel one screw at the tang should be all there is. The 2 on the other side of the lock should be there if not one is missing. I would not worry about a additional one near trigger you have no need to take it out. If you look thru the forum you should easily find some pics of other afghan pieces I have posted over the years. If not I can repost some
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