[Fishrising (Ben)]

Hi all! Can you please help with stamps/markings? Can anyone help correct me or help fill in my unknowns below? I have a 1925 12g GHE 30”

PIC1:
PS in a circle = parker spec. steel
HT over A = heat treated? something A?
Not sure of the mark to the right of the HT over A = 41? Barrel weight?

PIC2:
12 = 12g
Below the 12 is maybe a 1 1/? = ???? Assume 1 1/2? Frame size?

PIC3:
JG in a circle = James Geary barrel inspector

PIC4:
GH = GH grade, but no E and this does have ejectors
213643 = s/n from 1925
2 = what would this be?

Thanks all!