This is a Pennsylvania 19th century glazed redware bowl
with cream and green slip trail decoration both on inside and outside the bowl.
The prices of redware pottery reached their peak in 2008 when a bowl like this
would have sold for $500 to $700 retail. Countries like Lithuania began creating reproductions
and shipping them here by the container load and it made all redware suspect at that point, flooded the market and reduced the value.
These prices have declined considerably since then (I know, I once sold these bowls for this much!) with this type
of bowl now having a value of $200 to $300 retail.
Some sites that I recommend for selling are Varagesale.com, Ioffer.com, OfferUp.com, Ebay and letgo.com.
You can also go to invaluable.com or liveauctioneers.com and search their directory for an auction house near you and consign to them.
To finish, I will need you to click the five stars at the top of your screen and hit submit, thanks!