The black on those ends looks like what we see on a magic marker marble. Do you think the black was even painted or would you guess it actually was from a pen?
Is this it?
http://www.thecloroxcompany.com/company/heritage/bottle-guide/screw-top-bottles/
I looked on the cork top page and didn't see that shape.
They say the first clorox bottle was five-gallon jug.