Let me try, and I am sure someone (maybe several someones) will let us know if I am wrong.
AA - King Cobra (new action)
D - Detective Special, Cobra, Agent, Commando,
Diamondback, Police Positive, Viper
DA - Double Action .45
E - Army Special, Officers Model Match, Officers Model Target,
Official Police (old)
F - Reproduction percussion revolvers as a group
G - .22 Peacemaker, .22 New Frontier
I - Python, Trooper (old), .357 Magnum
J - Lawman Mk III and V, Official Police Mk III, Peacekeeper,
Metropolitan Mk III, Trooper Mk III and V, King Cobra
K - Frontier Scout 1962 (new)
MM - Anaconda
O - Government Model
P - Single Action Army
Q - .22 Frontier Scout, .22 Buntline Scout (old)
S - Postwar Woodsman
SF-VI - Detective Special, 1993 model
V - Short action version of the D frame
Now, if anyone is less confused than I am, please feel free to chime in.
Jim