I'm not really up on Parkers, but as late as the 1899 catalog at least a hammer model was still listed in U grade. This was same as T grade except with straight grip. Not positive, but I believe R, S, T & U were essentially same quality guns, with R & T being 10ga with P'grip & T & U being 12 ga with S'grip. These were at the bottom of the 1899 price list for hammer guns with R @ $60.00, S&T @ $55.00 & U # $50.00. The PH was $65.00 in same catalog. On the lowest grades of hammer models pistol grip & 10ga seem to have been $5.00 extra for either, but was simply choice on higher grades & hammerless grades.