Dave
I have just had another very close look inside the base and think there is no RD No just some unevenness, The more I look closely at the Jug I would agree Henry Greener, as I said in my first post there are some swirls inside the glass around the base, the same which I have seen in other Greener pearline pieces, also the glass just seem to have the Greener look, although the style does look more Davidson than any other Greener jug I have seen,
Roy