Unfortunately Hamilton retires styles without warning. It's usually decided by global performance, if the model isn't moving well anymore they will discontinue it.
The Murph I would imagine will be around for a while. It's a fairly important piece and the because it's THE Interstellar watch, it should stay relatively popular. If I hear it's going to be discontinued, I can send you a pm and you can grab one of the last available before they're all gone.
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