Hi,
I am a new user of this forum and I discovered this old post browsing pages.
I am pretty sure the stamp just left of S1444 is a Chauvière stamp : there is exactly the same C and wing on wooden Chauvière propellers decals ( for example, this one : http://inlinethumb52.webshots.com/9011/2928067850101100647S600x600Q85.jpg )
So the blade has to be a Chauvière serial 1444.
Sorry for my frenchie English,
Regards,
PM