http://www.nikonchat.com/nikon-fm2n/

What is the difference between the fm2n Nikon FM2 and Nikon?
I just bought an FM2 I selected 'out.I m not sure if it is a FM2 or fm2n.Is there a difference? Is one better than the other?
Here is the link that says it all http://www.mir.com.my/rb/photography/hardwares/classics/nikonfmseries/fm2/index.htm
Nikon FM2n + Nikon MD-12