@Chibs thank you very much! I’m not sure when it’s from but I think you are right that it’s a while ago. I’ve been buying IH/orSlow - Japanese gear for 3 or 4 years and it’s not been released in that period.
I was lucky enough to see it appear on marrkt.com barely used in my size for around half the retail price of a current green one, so that was a happy day indeed 
Edit: I adore my green one and it just gets better every time I put it on.. you have the green right?
There are denim versions of this shirt out there too which are nuts.. I’ve found a couple but not one in my size yet unfortunately