Thought it might be worth starting a thread dedicated to Daffy's, since it is one of the all time classic British bottles.
Here are four of mine. The three on the left are pontiled, the one on the right is an early smooth base (probably about 1860s). I also have a very late smooth base, probably about 1890 - 1900, not in the picture. Difficult to date the two olive ones, but I suspect that the order in the picture, left to right, is their age order, earliest on the left. Far left is bare iron pontil (1810s - 40s), second left is a circular glass chip pontil (1820s - 40s), third is lightly glass chip pontiled (1840s - 50s).
I think that the second left is one of the thirty or more found in a wall in the SW in the late 1970s. It is very heavily whittled, with heavy but indistinct / whittled looking embossing. There are several around that are just about identical to this one, and one of those is known to have been a part of that hoard. I've got the edition of the old ABC that told the story in about 1978. I'll scan it and put it up later.

There's a major difference in the embossing between earlier and later types, that seems to coincide pretty closely with the end of pontil marks. Next photo shows it. Top pair are both pontiled, bottom pair are smooth base. I reckon that the change in embossing happened around 1845 to 1855. I have to re-read Guy Burch's BBR article to see what he says about it.

I know several of the forum members have very different Daffy's bottles (such as a self-dug very dark half size ....!). Anyone want to show one or two??
Jerry