M1917 markings

[Gothmog]

This one saw Canadian service and has the red band painted on the forestock with 30'06 over printed in white. It has a few markings on the buttstock and barrel (see pics).

Can anyone decipher these?

I mean, apart from the C broad arrow ... and the E for Eddystone.

Information

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[tiriaq]

CHO - ?
Barrel was made September 1918. US ordnace mark.

[Claven2]

Hart to make out in the pic. Maybe GHQ = General Headquarters rifle No.210? Just a guess.