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666 means 666

And of course the Bubble back,![]()
All I can say at this stage is 50M means don't take it diving or snorkelling.
Before it ends
There is often misinformation on these threads. And quite frankly some crazy points of view to suggest the speedy is incapable of withstanding anything more than a rain shower.
Water resistance comes from the use of gaskets and sealants. The speedmaster has the same seals as the seamaster.
The speedmaster is likely able to dive deeper than its expected depth of 50m
The seamaster is rated deeper because like most designated dive watches it uses thicker, bigger and stronger cases to withstand significant changes in pressure and temperature. Along with deeper rehaut and crystals.
Screw down crowns have virtually nothing to do with water resistance. They primarily protect the stem from damage and accidental use.
It is a fact that the screw down crown can prevent dust or particles reaching the seal which in time can act like grit and reduce the seals effectiveness.
And that there is the key, correct maintenance and you won鈥檛 have any issues. Just with a speedy, you won鈥檛 have the protection around the pushers and with them being manual wound watches any debris in the seal when winding can weaken the seal quicker than other screw down automatic watches.