I think we're all forgetting the impact of a cuckoo on trim and buoyancy. A wooden cuckoo could pop out and throw you feet up, off to the surface, all sorts.
I can't believe in this day and age we're talking about using wooden cuckoos. You guys need to get with the times.
Brass is what you're after. Old school look, plus doesn't corrode much and won't rot. You can get some nice stainless workings for it, but then if you're using the fresh water model then you can make the whole thing out of mild steel.
I remember back in the glory days when we used to have dive timers that would run out of digits for decent dives. THat said, it's not hard to work out that you're not at 1 metre, because you just went a bloody long way down. I don't know many people who can't remember how many hundreds they went down
I do want one of these things mind. If only to see the new cuckoo feature. I've been thinking about getting a water vole for the rebreather, it could just walk around the loop and if it dies I know I need to bail out.
Digs.