Pre 1891, razors weren't required to have their contry of manufacture on them so it could be from anywhere but a good number came out of Germany so that's probably a good bet. It looks as if the taper is the shape of the blade. It's what is called a smiling blade. I can't see any more hone wear towards the tip of the blade. I think that for 25 euros, you did pretty good. Get it honed and shave with it.
I think that smile on the blade is genuine. Not the cause of over-honing.
There are no honing wear at the spine so it would mean tape was used while honing heavily on the toe, which I find very unlikely.
My Fontenille has a similar shape, although not as pronounced. I think your blade was designed that way for comfort.