Mike while in agreement with you in regaurds to the body of the bottle, the handle and the rolled top suggest an older date of manufacture 1825 to 1840.By the 1850s applied tapered lips were the fashion chosen most often.This is clearly a top more closely associated with an American Chestnut bottle then an 1850ish jug.While the body of Rorys bottle is rounded more towards the bottom the rest is a pretty good match to the one in the book.
Last one Mike,a good debate for the readers,[]First your Mckearin reffrence plate 48.Bottle number 2 and bottle number 8 almost dead rigers except for the tops of each as they are applied suggesting 1850s or later on each of these.
Now lets open our minds for a moment seriously,Look at the three pictures of bottles I have combined into one.I removed your handle to allow for a better comparison in regaurds to the bodys of each bottle.A Wistar Chestnut late 1760s,Rorys bottle and your bottle.The bottles in Mckearins book look more similar to the Calabash pictoral flasks prevalent in the 1850s then the rolled tops on these bottles.I strongly feel your bottle is early 1840ish Mike and Rorys is an 1830s bottle.Both of your bottles are more crude in make up then Mckearins plate 48 bottles.
I don't even know how you can compare that chestnut bottle to these later HANDLED pieces... at least 30+ years between the them. We can let others decide.
I think one thing that may be confusing the discussion is Road dog's bottle appears to be an exceptionally crude example of that form. Maybe a "Friday afternoon" bottle at the glass factory? Of couse we love crude examples best. Bottles collectors are like the Island of Misfit Toys , we gravitate towards the extraordinary.
Just my opinion of course. Not really my collecting catagory, but I like it.