Makers mark

[Holindaze]

I found half of the bottom of a bottle and the piece i have has a capital A with a capital P, B or R leaning on the a and under this is a small capital K. I have never seen anything like it and I probably never will see another one. Is there a website that you can use to help identify these?

 

[cowseatmaize]

It sounds like the American Bottle Co.
Here's the best site and has a pic. See if that's it.
http://myinsulators.com/glass-factories/bottlemarks.html