What is it Please? Lime Green

#1
What is it?
I bought this bike over a year ago just for the motor and after riding it I may use it as a beater for others to use. It runs great and I am going to change the mess that was there for a chain set up and adjust the brake.
It seems to be well made and I need a new head bolt to rid of the cobbled mess that was there. Any help would be appreciated. Are the wheels original and are they aluminum under the ugly paint? I can try a magnet too. Thanks Gary M,
 
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