What is this tunic?

[Iron Comrade]

I came across this tunic, Its clearly not an a pure original because of the post 1973 Sergeant Major shoulder boards either that or the shoulder boards have been changed, but there is a stamp inside and is dated 1968.
What is this tunic I kind of like it.

http://www.ebay.co.uk/itm/ORIGINAL-U...item2ebef984a3