the 4 14 indicates the unstruck barrel weight of 4 lbs., 14 oz.
The JS is the barrel maker's stamp for Jonathan (or John) Stokes.
The small P in the diamond may be an indication of barrels made by Parker Bros. rather than the customary imported barrels.
A Parker lifter with Twist or Plain Twist barrels is usually a grade 0 or a grade 1.
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