This is an antique medicine bottle embossed "Henry K. Wampole & Company" on both sides with a  circled "W" and "16" on the bottom.  A Circled W is a mark used by the Mosser Glass Company of Cambridge, OH but as they didn't make utilitarian bottles, it most likely represents the name Wampole. The rectangularly shaped clear, remedy bottle has beveled sides and could be considered octagonal.   Due to features such as embossing, suction mark on bottom, cork topped, and brand, best date estimate would be between the late 1800s and 1910s.  My father, an avid bottle digger, found the vintage medicine bottle over 40 years ago in the ruins of an old homestead in Virginia.  The bottle is in excellent condition, free of breaks or cracks.  Clarity is nice with only minor sediment deposit at neck and side.  The bottle measures about 8.5" x 3" by 2".

Henry K. Wampole was a Philadelphia based pharmacist who began marketing his tonics in the 1870s.  He offered a variety of popular remedies and tonics into the 1900s that were advertised to "relieve brain-fag, headache, and nerve-tire in general.".  Ironically, Wampole suffered a breakdown and was sent to rehabilitate at a sanitarium.  Subsequently, Wampole mysteriously disappeared from a Philadelphia hotel in 1906 and eventually his body turned up in the North River.  Wample was later found to have falsified accounts and destroyed company records.

For More Information:

http://www.papergreat.com/2011/02/delving-into-henry-j-wampole-company.html

https://glassbottlemarks.com/bottlemarks-5/