GH was a hammerless gun made from 1888 onwards. This gun is not a GH-Grade. The 'H' stands for Hammerless.

Parker Bros. hammer gun grades are a single letter. U was one of the four grade letters for a Quality 0 hammergun. In the hammer gun days, Parker Bros. charged $5 extra for a 10-gauge gun in their lower Qualities and also $5 extra for a pistol grip. So, within Quality O guns there was an R-Grade which was a 10-gauge with a pistol grip and cost $60; an S-Grade which was a 10-gauge with a straight grip and a price of $55; a T-Grade was a 12-gauge or smaller with a pistol grip and cost $55; and a U-Grade gun would be a 12-gauge or smaller with a straight grip with a list price of $50.

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