The U stamped on the water table by the serial number indicates the Underlifter type of action. The grade 0 guns don't normally have anything stamped indicating their grade. The grade is most often determined by the Barrel steel used. Normally the various Twist Steels were for grades 0 & 1 and Damascus Steel barrels were used on some grade 1 guns and most all of the grade 2's and above.
In my limited experience, the stamp indicating Parker-made Laminated Steel barrels is the P with the broken left side of the foot, stamped on the forward area of the right barrel flat, such as in this illustration...
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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