P with in a circle and number 13.
I looked it up on a few suggested sites, however the bottles with that marking also have embossed wording on the side. This bottle has nothing.
this is what I came up with.P in a circle……….Pierce Glass Company, St. Mary’s, Pennsylvania (1905-1912); Hamburg, New York (1912-1917); Port Allegany, Pennsylvania (1917-c.1980s).
For future reference this is the site most of us use for marks on the bottom of bottles- GLASS MANUFACTURERS' MARKS ON BOTTLES & OTHER GLASSWARE
Your bottle would have had a paper label which is the reason for the lack of embossing. It would be considered a common bottle with little value.
Yes, I love that site. I have a bottle up on his page that we can't find any information on except for a rough estimated year. The R with the sun around it. It had us stumped.