A little ID help please

[Horsehide]

Ok guys, this is my first post, but I have been shaving with a straight blade for the past 25 years, or so.
While my Henkels 60 is out getting some well needed TLC, I brought out my great grand father's razor out of the safe.
I know very little about the man and even less about this blade. Family lore says he used it in the trenches during WW I.
It has a cheap plywood box and the scales are a nondescript hardwood.
The markings are partially worn: maybe 58 (?) and (x)OUCILLE (P)ARIS in an oval.
Any info would be welcome.
I will turn 50 next week and I remember my Dad cutting my hair with this razor as a kid.