From boutique Blue diver is relatively easier than any ROs in any size. I've been offered the Blue diver amongst couple other ROOs but declined as I'm waiting on my RO as 1st . I just finished my appointment at boutique this week. Was told black dial 15510st is "very" difficult 1st purchase. I'm working on getting a grey 15510st. She also hinted the black dial might get discontinued as well. Of course YMMV. Don't quote me I just relate what I've experienced and what I was told.
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