The HCCo. is probably Hugh Carson of Ottawa who made a lot of service leather in both wars, including things like the cases for the Canadianissue Warner & Swasey Mod. 1913 scopes. The date could be when the scabbard was made, or just when Carson inspected and/or refurbished it.
IIRC the bayonets began with the rounded tip and the pointed tip was a modification originating in Francewhen the original shape was found inefficient at penetrating Prussian great coats. ;-)
The bayonets converted to knives are easy to spot because very little bayonet was left when they were finished. The steel was said to be of particularly good quality.