Looking for date of broken bottle pieces

[bruce01364]

Was rummaging through a pile of broken bottles. Found this bottle bottom with a pontil mark. Not sure how to date them so posting here. The concave bottom is recessed about a half inch. Also found the top of a bottle in the same pile. I believe the lip was attached after the bottle was made. Not sure if the top and bottom are from the same bottle as there were a few broken bottles in the pile. Can anyone give me an estimate of when these bottle parts were made?

 

[taz42o]

I would think 1840-1880.

 

[bruce01364]

Thanks Taz.

 

[HuntinDog]

Your base has a broken off blow pipe mark that is referred to as open pontiled.
Your top has a applied top.
These two indications would date a bottle to before 1850s.
Most open pontiled bottles were replaced with a iron pontil in the 50s and 60s.
Nice pieces, should be some good stuff in that area.
Good Luck