Kobold has been one of the preferred diver watches for awhile now from what I understand. Some of the base models are ETA mov's but their casings are pretty industry standard-raising badass mofos, particularly for harsh conditions.
Given their ETA engines on gens, this should be fairly easy to rep.
Besides, one doesn't even have to look like a tool with a submariner rep, walking into AD's; with Kobolds, you won't get called out... by anyone!
(Then again, there is very little incentive for rep manufacturers to rep timepieces that are so specialized and obscure, if there is no "(fake) I'm rich biyatch" factor.)