I took a look at this jacket. It isn't a surplus coat, and it isn't made by Sterlingwear.
If you haven't already, take a look at my peacoat dating guide which is linked to in my signature line below. it will tell you how to distinguish the issue peacoats from the civilian copies.
Thanks for the help, the dating guide was helpful. I am not going to bother with the peacoat if its not made by sterlingwear, i suspect the quality will be poor. Maybe I will ebay a vintage one, six button, kersey wool, with corduroy pockets is the jacket I truly want.