The G-9200R-4 is definitely a real G-Shock. Here's a stock image of it:
Some of the details in the description must be off. The G-9200R-4 is the non-atomic Men In Rescue Orange Riseman that came out in 2008 (not I.C.E.R.C. or Gulfman). It looks like around $140 USD would be a good deal on this one.
I've never seen a fake version of this model, but there are fake Riseman out there. Post some photos if you'd like us to give you better advice on it.
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