Most likely a scammer, he tried to with me when buying items anyways. Be careful.
Proof:
Chat log 1:
Screenshot by Lightshot
Chat log 2 & Skype username:
Screenshot by Lightshot
The image he sent as found on my selling thread:
https://i.imgur.com/g1gO5.png
Note I was half asleep when editing that picture, he also edited what the red arrows point to.