I concur with Paul’s comments:
Greener & Co., ‘2nd lion’ trademark (a nice clear mark with the lion holding a halberd in its upper paw); date 1885-1900.
Certainly not a registered design that I know of.
I haven’t seen a creamer in this design before, but I do have a photo to show of what seems to be a matching pedestal sugar bowl, also bearing the 2nd lion trademark (but no RD number); bowl top diameter approximately 6 inches.
Chris, I will add the creamer images to my reference archive of photos of Henry Greener and Greener & Co. unregistered designs, and I hope to begin an open-access Glass Queries Gallery database devoted to them soon.
Fred.