This is a Wonderful Vintage Green Jadeite/Jadite Flat Bottom Coffee Mug or Shaving Mug with the D-shaped handle. It looks like it wasn't used and has a Wonderful sheen to it. May have a straw mark/swirling.
It measures about 3 1/2" high and 3" across top opening. It has the Flat bottom and is marked OVEN Fire King WARE. It has no chips or cracks, there a tiny gray mark at inside top(I'm not sure if its in the glass or silver mark, but I didn't want to attempt to clean it.) It has Nice sheen to it, looks unused.
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