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FEBRUARY 1974
The Schwinn bike serial number H19577 was made in 1951.
2003
August 1974
1984
http://www.re-cycle.com/History/Schwinn/SwnB_Serial.aspx#location
November of 1981.
June, 1967
85
I just searched for the serial number of my Schwinn Collegiate. From the same source it appears that mr850439 was manufactured in December 1980. Here is a reference: http://www.bunchobikes.com/serialnumber5.htm
This really depends on the type of cruiser, how old it is, and what kind of condition it is in. A used beach cruiser will usually sell for $50 - $100. Now, if you have a vintage cruiser or an old Schwinn some can sell for as much as a few thousand dollars. If you have something you think could be worth money I would find the serial number off the bottom of the bike and contact the manufacturer for more information.
If the serial # is on the headtube, that bike was made in Chicago in October 1975.