Winchester 1897 Trench gun. Identification/History

[superhero]

Hello All.

Here is my 1897 Trench gun. I am in love with it and purchased is about 15 years ago.
I am starting to research its long history in the military. I believe it came to Canada from a batch via Korea.
I have dated the serial number E 679xxx to 1918 but believe it could have been earlier.
Has Flaming Bomb and cyl along with PW stampings.
Has this been refurbed for WW2?
Is is possible it saw service in WW1, WW2 and Korea.
Does the proof on the stock WB indicate WW2 refub? Is the stock original?
Are there any other markings I should look for?
I love this shotgun and want to respect its service history...

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