It looks real but I think it's a fake. HELP

Hi, First of all I know nothing about bikes besides how to ride one. Has anyone ever seen this type of   serial #? I checked for serial#'s and I found one turning the bike upside down and a space on the frame between pedals there is a number and it does not make sense to me.  EZ894150  The badge on the front has four digits going sideways, those numbers are 0050. I have looked and haven't found anything.

 I looks like a Ladies Schwinn Beach Cruiser, it's green and it's one speed. Also has fenders,  fat seat, white wall tires, says Schwinn cruiser, Schwinn badge on front. I am planning to add it to the yard sale and I have been asked by people about it and they even assume it's authentic but I do not want to say it is or it is not because I do not know.

Thanks for any help

Definitely not an old bike!  

Seat tube is the wrong diameter for a vintage cruiser

Fork is wrong type for vintage Schwinn (would be a "blade" type fork, rather than a tubular fork)

Frame shape is wrong too...

From what I can dig up, the 4-digit code on the front of the headbadge is the actual manufacturing stamp.  They don't have the decade, just the year - that bike would be January 5, 1990 or January 5, 2000 - can't really tell which with the photo.  Judging by the bottom serial number and how it fits with the earlier date codes, I'd most likely call that a 1990 bike.  It's a Schwinn though!