The Fenton pattern is slightly different. It has hobnails in between the daisy like flowers or stars. Thought the part about the Fenton pattern might be of interest to others.
My final posting on this for now
With regard to the above observation, it's absolutely correct for most of the items in Fenton's Daisy & Button line (which actually metamorphosed into their Olde Virginia Glass / OVG line, in the 1970s). The clue is in the pattern name! - daisy like stars and buttons (hobs). But the basket we're discussing (the "Oval English Basket")- although always shown as part of the Daisy & Button line, does not have the hob/button motifs. It is identical (to my sore eyes) to the original Davidson basket.
None of this proves one way or another whether the basket we're discussing was made by Davidson or Fenton. All it shows (to me at least) is that the baskets are more or less identical. If a piece has the RD on it then it's Davidson. If it's in pearline, then it's Davidson. If it's red/orange, then it's Fenton. Beyond that, then I think we are not able to say on the evidence presented so far. Or have I totally lost the plot?