Keven, I do not own 198084 but I did research it some. According to the serialization book it was a grade 2 gun (GHE) with 26" Parker Special Steel barrels chambered 20ga and capped pistol grip stock.
Being that the stock has grade 5 checkering, grade 5 drop poinst and skeleton buttplate and a 5 stamped in the trigger guard inletting, I would say it is a lower grade stock that has been upgraded to grd 5. According to the Parker Story there were no 28ga, 20ga or 16ga grade 5 guns made with 6 digits in the serial number that ended in 084 that they had record of.
I don't know if that helps in any way.
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