I call it the 4903 rectangular when I can’t distinguish the alarm. I think I’ve seen 9219s at a Holiday Inn near Hersheypark were there are also 9838s on 4903-9501 plates. I just think that because they are both electromechanical. BTW, I can spot another difference between the 9237 and the 9422.
-9237: The Simplex logo is big.
-9422: The Simplex logo is small.