Best case backs

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Caseback from Thomas Preik. Liking it better than the Omega sapphire caseback.
 
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Alam's gold Longines Flagship shown in his post to this thread is my very favorite case back of all. The Constellation case back he shows beneath his Flagship is my sentimental favorite.
Edited:
 
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Gotta be the clear kind where you can see the movement OR one that's personally engraved with meaning (either to you or a previous owner)
 
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Wearing my X33 solar impulse today. Forgot how cool the case back was.