Did it serve a function? Was it a manufacturing limitation? Just realized this is a question I need answered.
Probably the same reason ancient Romans used arches. I would think that the curve adds strength.
It did serve a function. They were using acrylic crystals, which aren’t as strong as sapphire, so as the pressure increases, the weakest point of the Watch was the center of the crystal. By creating a dome the pressure was dispersed more evenly, allowing for greater WR without making the crystal thicker.
Well this definitely makes sense. I guess that’s my answer. Thanks
To resist under water pressure
I have an Oris 65 diver with a massive dome crystal and when I go swimming it's actually better to read under water.
Writer, aspiring filmmaker. LA and NY. Love old stuff and mechanical things. History matters.