Straight razor use, honing and restoration
Never saw one if those before. My comment is purely based on observations.
Maybe you can sharpen the blades at the same time. One with the down stroke on the sharpening leather the other one with the up stroke. The sharpening uses the same time but you can use a sharp blade twice as long.
I've never seen one of those IRL, but I would have guessed that both blades are fixed on the same pin, which would make sharpening both blades at once impossible (or at least: difficult). But your guess is as good as mine....
I've seen these around too, they're neat but I resisted the impulse to pick one up since they seem a bit awkward to actually use.
I don't know anything about them but would guess perhaps this is a handy way to have two good edges for travel when you won't have time or equipment to touch them up and want it to pack down compactly?
I am vaguely aware a French shaving forum exists focused on straight razors (though I'm not fluent) so I took a shot at some searches:
https://www.google.com/search?q=%22papillon%22+site%3Acoupechouclub.1fr1.net&tbs=li:1
https://www.google.com/search?q=%22deux+lames%22+site%3Acoupechouclub.1fr1.net&tbs=li
Best I could come up with though was this picture of an old catalog listing a new one: https://coupechouclub.1fr1.net/t29535p50-les-derniers-trouves
Thanks for the links, I didn't know this forum!
It seems that these razors were built by French sailors, steel quality isn't very good, and it's not that clear why they're the way they are.
What seems to be consensus is that you shouldn't shave with these 🤣
What seems to be consensus is that you shouldn’t shave with these
I dunno, the razors in that Duvert Frères catalog look pretty legit, I think if I wound up with their double bladed one I'd give it a try...
One guy on the French forum wrote that they don't hold the edge from the beginning of the shave to the end - but still, he was happy to use it 🤷♂️