I can't say never, but there is usually not a grade stamped on the water table. Many times (again not always) there will be a stamp on the lug of the barrels as to the type of barrels. A simple "T" for Twist or a "D" for Damascus. Of course the "T" would mean in this case a "B" grade or a "D" in this case would be am "A" grade. The ser. no. range puts it right in the "A" or "B" grade range.