For a long time I've had a Christopher Ward C60 Trident Pro GMT 600, a GMT dive watch, and I've often used the dive extension on the bracelet to make it a little looser on hot days -- it adds about 1/2 inch. Now I also have a 1983 Rolex Submariner, also of course a dive watch, but the dive extension on that bracelet adds about an inch to it.
Why are these so different? Dive extensions are there to make a dive watch big enough to fit over a wetsuit, and I was assuming wetsuits were pretty much the same. So how can one dive watch have a dive extension twice the length of another one? Have wetsuits grown sleeker since 1983, or are dive extensions pretty much random? And if they're random, what's the point?