I was going to junk this bottle

[john glassman]

This a very common bottle eveyone has dug this bottle. This a ground pontil it called Pure Sperm Oil For Sewing Machine .The bottle even has crack and I dated its1866

 

[sandchip]

That's not a ground pontil, but just a smooth base. Still a nice bottle though.

 

[RelicDude]

i have to agree with sand chip its just a smooth base. i dont think ive ever seen a bottle with a ground pontil. this style of pontil was mostly used on pitchers, decantors, and flint glass. regardless its a nice bottle.