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"Naiad" was a design of "waterproof" crown used by Omega on a number of watches.
Used on SM300 variants and later replaced by screw down design.
It seems like you need change the watchmaker as well as the crown 😀
Search the forums for a recommended one.
btw, a question for the forum: Does the NAIAD crown always have a star inside the Omega logo?
Thanks - I have been trying to take better pictures but my phone seems to not want to cooperate - although actually i just tried to pull out the crown very gently and the crown completely came out, meaning that the repair has failed in a record 2 days

The only problem is the parts for this movement are obsolete and we are still in the process of trying to stock them, when you drop the watch in I will give you a time frame.
just out of curiosity - I know i've had enough feedback here to say that the crown looks wrong - Can anyone tell me a bit more why it looks wrong? Thanks again ! 😀
This is completely false. Omega still makes the parts for this movement, so that tells me that this watchmaker is not Omega certified - you may want to find one that is who can order parts any time they need to, and get you the correct crown as well.
The plot thickens. I just called omega directly, and they do indeed say it is a serviceable watch with parts.
However, they said it is more likely that they told the watchmaker that they wouldn't send parts to them as with a vintage omega like that they want it go directly to Switzerland. And they asked me if I would want to send it to them lol
So... now I am stumped. I am trying to schedule an appointment with the watchmaker directly because I want to look them in the eye and get the real information from them and go in with armed information.
The plot thickens. I just called omega directly, and they do indeed say it is a serviceable watch with parts.
However, they said it is more likely that they told the watchmaker that they wouldn't send parts to them as with a vintage omega like that they want it go directly to Switzerland. And they asked me if I would want to send it to them lol
So... now I am stumped. I am trying to schedule an appointment with the watchmaker directly because I want to look them in the eye and get the real information from them and go in with armed information.
I'm not sure who you spoke with at Omega, but the parts are readily available to any Omega certified watchmaker.
I can order any part for that movement with a click of my mouse this morning on the Omega Extranet, and have the parts at my shop by Wednesday...
I think I'm going to have to try and get my money back from these people. they just called me back to say that they can't meet with me directly
I assume Omega extranet is only available to omega certified shops?