They all tend to look like they are transparent plastic imo.

The Hublot one with a full sapphire bracelet as well looks like a g-shock.

I'll stick to metal, however cool an idea it seems in theory, im not sure it works (for me at least) in practice.

 

Check out CORUM Golden Bridge, and Vincent Calabrese ~ patent holder.

 

Bell & Ross BR-X1 Tourbillion Skeleton Sapphire.

 

When ever I think of see through cases my mind always jumps to Swatch watches. Sorry, not for me, a good display back with the movement filling most of the area is fine for me plus not a big fan of skeleton dials either with the only possible exception being the GO Panoinverse.

 

£72

 

I will say @Raggie that I think if you like sapphire cases then ceramic cases maybe of interest to you also

the black ceramic Tudor , omega , AP are all beautiful

the blue ceramic Royal Oak thing is really nice but I think there is risks of chips and cracks rather than scratches but I’m not really sure to be honest I think a few members Here have the ceramic Tudor and OMegas

 

 

DEFINITELY can’t afford one!

And the wrist they show it on is comically pipe cleaner grade.

 

There was a guy on e bay a while ago selling old Westminster chime clocks rehoused in a clear, presumably perspex, case. Looked quite cool actually but he wanted a fearsome price for them.

 

This is good enough for me.
Got the Hamilton display back case a few years ago in a swop for some Waterbury bits and pieces.

 

Whatever the pros and cons of sapphire as a watch case material, I have a problem with all transparent/skeleton watches, and that is they aren't going to look very good on a hairy wrist. OK that B&R looks very cool on a perfect white background, but imagine it with an arm behind and it is no where near as appealing.

 

Closest I've got is the extraordinary looking Ciga Design, which has got glass on both sides, and is therefore completely see-through (although that's not obvious from the photos):





Ignoring the fact that the time is very difficult to see, it's a fantastic looking thing on the wrist, and I really must wear it more often.