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I have both the Rolex (without the diamonds) and the JLC which I LOVE. If I had to choose one hands down it would be the JLC. It is a gorgeous and runs really reliably. And it makes a lovely swooshing sound from the rotating bit at the back when you move the watch close to your ear. And I love the see-through back as well.
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I bought it in Asia from an AD and was able to get around 25% off if I remember correctly. But it took months to find one that would give more than the customary 5-10%.
Hope this helps. But fingers crossed you get the JLC!