I've finally got around to having a Superdome crystal fitted to my Sub 1680. I know purists might sneer, but I can't tell you what a huge difference it makes. The watch is so much more wearable now, the dial more legible without the cyclops being in the way. The crystal giving the lume plots a beautiful 'oval distortion'.
The cyclops never really made much sense to me.. it broke up the clean dial and you had to look at it dead-on to see the magnified date. For a tool dive watch, I always thought this a frilly pointless addition. Plus the original 'top-hat' crystal was fairly flat, and was very 'mineral glass-like'.. I'm so pleased with the super dome.

Thanks to Jimbo for sorting it all for me!

Anyway, enough waffling - here it is, a '78 Sub 1680 with Superdome crystal..

Stewart
- Heuerville