Parker Bros. did all kinds of wierd and wonderful stuff whan it came to weight and balance. My Grandfather's 1890-vintage PH-Grade 12-gauge was on a 3-frame but with 30-inch Twist barrels that swamped in very fast, so that it weighs 8 pounds 8 ounces. Lots of weight between the hands. My 1889 GH-Grade is on a 2-frame, and with its 30-inch Damascus barrels which are very straight, weighs a fraction of an ounce over 9 pounds and is very weight foreward.
Years ago when Kevin and I made a road trip to compare his GH-Grade "Grandma's Gun" Damascus barrel 28-gauge with one of its three siblings, the one gun had a very typically 0-frame size stock while the other had a larger, more typically 1-frame size stock, though both guns were 0-frame. Unfortunately, that doesn't show very well in the only picture I have to record the event --