Hey just going back and forth with another forum member about actually wearing Dive watches or Chrono, both purpose built, and they serve little purpose for me. But I do like the look. I have a few divers and a 7A28 but they rarely see the wrist because of their size/weight, unless I need the function. Water Resistant, doughnut counter, etc. I have started to wear that LeGant (I'll re-post the photos) which is so worn no nonwatch guy would think its even a dive watch. I have those Caravelle Diver's with the Citizen movements and enjoy those too, more so because of the size.
So around the bout way of asking. 1. Did Seiko ever make, for themselves, a manual wind dive watch? 2. Has anyone tried to put a manual wind into a dive case? I imagine it would need to be fitted to a Quartz case because of the thickness between the two would be closer than adding a manual wind to a Autowind case. Stem height/length seems to be the biggest issue when doing movement swaps...3. Since I have never held a Seiko Quartz Dive watch are the cases slimmer then the Auto counterparts? Did this project just end there?
I'm equally interested. I don't know of any Seiko's as the 66 movement range tends to be cased more as a dress than a sport watch. Are you averse to the Swiss mechanical divers? Certina argonaught and ds series have some very desirable mechanicals that are over 40mm. Citizen have some para water mechanicals and there is one floating around that is a mechanical alarm sport diver. @jringo may be to identify a few models but it uses a Swiss movement. My one was a citizen 63-7067
As for the Seiko Quartz divers with slimmer cases... I think you will be looking for a while and would be better off spacing the mechanical movement with a ring retainer. Most low end Seiko Quartz divers do this with their Quartz movements also. (I'm thinking 7n43 and 5hxx series) the height of the Quartz is no where near the height of the case and they use a green space to hold it in place.