Sourced from Reddit, so take it for what you will.
But this is far more logical one compared to MR-G CasiOak that I posted few weeks ago.
Basically, an update to GM-2100 (half-metal cased version of original CasiOak) with Tough Solar and Bluetooth, like how GA-2100 became GA-B2100.
I guess they couldn't name it GM-B2100 since that's already occupied by full-metal CasiOak series. (Mind you, this one is different from that. Not just the obvious band change, but the case will have Carbon Core Guard + basic screw back instead of full metal case with screwed down back).
I think the black DLC case with white band is speaking to me.
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At this point I feel like there has been 100 models of the 2100 and they all look the same to me. I find it difficult to follow the evolution of that line because they are pumping out new models with the tiniest differences at a crazy pace. 🤷