"J.S." is the mark of John Stokes.
5 with a smaller raised 12 is the pre-struck weight of the barrels... 5 lbs., 12 oz.
D with a smaller H makes no sense as a grade marking as this is not a DH (H indicates 'Hammerless'). If on the barrel flat under the right barrel at the forward end of the flat a "D" indicates Damascus and toward the rear of that same flat a 3 would indicate a grade 3 or D. If there is no number stamped there it would be a grade 2 or lower.
On the water table look for a 2 or 3 also indicating the grade.
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