M Sub is the last series made before they changed to the ceramic bezel and larger case design.
The ceramic models are quite expensive, and as is the case with many things when buying new, you take the depreciation hit as soon as it is purchased.
It will be some time I think before the ceramic Subs go up in value unless bought used.
There's many many mint, unworn, pre-ceramic Subs for sale, and here you're going to spend around 5 grand, but I'd bet at any time thereafter you'd be able to sell it for as much or more.
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