That plate is identical to 3 H's I have all bearing an '07 patent date, two twist & one steel bbl'd. I am not sure but think this started around '05-'06, I just don't have anything handy to look at between ca '04 & '07.
sidebyeach; does your gun have the 1907 patent date on the trigger plate? Per the SN, estimated date would put it as an '06 gun. Also note the different appearence of the closeup view of bbls on doubletrouble's H grade & those on his earlier posting of the GE. Lefever catalogs as well as other gunmakers of the era all refer to those on the H as "Twist" & those on the GE as "Damascus". With the 2 numbers on the steel bbls it probably was added later & I would bet the straight grip is either a modification or re-stock.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra