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The blade has most likely just been cleaned up, I don't think it's been reground.
It most probably been honed correctly and is ready for use. It should work very nicely, probably even better than a...

That includes their basic maintenance and handling training ?

More than 100 years old (like around 130 or so), same Espinasse as stated above, not too badly restored but many a French amateur would have done a far better job.

While Planete Rasoir is a renown...

And then, when you are a French connaisseur, and even though you might know a trick or two, you will always be humbled by Ferdi's knowledge.

Render unto Caesar...

I had a few doubts with this...

Most likely a very late 19th century Thiers razor.

A good reflex to have when you are looking for information on a French razor is this fine website
Couteliers Thiers

Here we can learn that...