Hi, and welcome! - there are lots of things wrong with the green bag in the picture which you're asking about.....it's a counterfeit.
I'd recommend you to have a read through the Mulberry forum, plus we have Clubhouse, Reference and Shopping threads that have a wealth of information about styles and leathers, etc.
If you find a bag on the secondary market that you're interested in, feel free to post it on the Mulberry Authentication Thread (link below) and our experts will have a look at it for you...
http://forum.purseblog.com/mulberry...mulberry-please-read-post-1-first-901871.html
There are a lot of knowledgeable people in the Mulberry form so don't be shy about asking questions!