Lady's Schwinn. Serial number is B340240.
Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. It only takes a minute to sign up.Sign up to join this community
According to http://bikehistory.org/schwinn.php?serial=B340240:
Your bike is an original Chicago Schwinn. Built: 02/22 of 1963
The site from Daniel Hicks says it was built February 22, 1963 and is an original Chicago Schwinn.