Maravilla was a Spanish razormaker that made dualsided DE: one side was regular, the other side curved, actually frowning. I suspect Ssseygus got their inspiration for the Zeppelin, which is a frowning DE, here.
The razors shave rather good, even the curved side, and I've taken a liking to these nice little Curvada
The razors shave rather good, even the curved side, and I've taken a liking to these nice little Curvada