I enjoyed seeing a dive watch with a freedive spearfishing theme and the Speardiver name, albeit with a different spelling Spear Diver Watch. I don't know what makes this watch from Helson watch company be worth $600, maybe one of you watch aficionados can say? From a bit of research looks like it's a homage to an old classic dive watch, the Seiko 6105.
Seiko 6105