Good comparison and you are right. There is a difinite difference in the arch panel. This Hartshorns has a faint large circle on the base and if you run your hand over the base it feels smooth with no indentations from circle.
Thanks for posting that, it helps date it a bit.
I was trying to figure out where it fit in the Hartshorn chronology.
I would love to see one with a label.
Dr poland and Dr hartshorn bottles have a lot of similarities. They both had bottles made at stoddard, both sold in Boston, both started in small towns , etc etc...