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the ultimate:breitling avenger chrono m1 ...the only chrono rated and OPERATIONAL at 1000m(all others I know of(not sure about the zenith defy extreme chrono),have non functioning mechanically operated push pieces at these depths.you have to keep them screwed in so they retain their water resistance.this one has magnetically operated push pieces!!!.its also not THAT expensive compared to the others).Thes watches also have chrono pushers with an operational rating to the depthe that the watch is rated.
Blancpain 50 Fathoms Chrnongraph
Omega SMP Chronograph
Omega Planet Ocean Chronograph
Omega Broad Arrow Chronograph (Not a diver but 100m rated)
TAG Aquagraph
IWC Aquatimer Chronograph
Sinn U1000 Chronograph
Casio G-Shocks
Citizen Aqualand series (I think)
I believe there are several others but Can not put my finger on them just now.
dear vince(I agree that there must be others,also)
thank u for your reply.I have to stress though that my remark was depth(1000m /)and operability.the chronos I know rated at these depths are the zenith defy extreme the panerai slytech and anonimo professionale 1000m chrono but none are operable as chronographs at these depths...they are just water resistant and functioning as watches only,or as chronos if started at the surface or at more viable depths...(at least that was the statement by breitling at their site.)the ones that you mentioned are rated 100,300,600,100,500,120,?,200,200.I have to admit that although I am familiar with the sinn U1 , U2 I dont know about the sinn u1000 chrono.could you please send me a link?there are time pieces rated at even greater depths than those(my IWC aqtimer 2000m, bell & ross at 10000m(liquid filled like the sinns..)and surely several others!!!anyway this was purely philosophical as we say in greece because I am not going to test any of these watches at even the depths that they are rated(even the "shallower ones"!!!).I will also continue to dive with the mudman.I and as I understand ,you, also are intrigued by the complexity ,the technicallity involved in these wonders of miniaturization and their endurance in harsh environments.
p.s.: to the other scubaboarders sorry if we bored you but I guess when it comes to personal taste or opinions there will always be diversities !!!