To be honest, this one is confusing me and I can't say for certain that it's a Keith Murray piece.
 
On the plus side:
It's hand thrown
The height and width are exactly the same as other Keith Murray black basalt beaker vases such as the 3888 beaker I recently sold (see the picture of them side by side).
The impressed herring bone pattern is exactly the same as that on the 3888 vase (just reversed)
I've seen these beaker vases sold as being by Keith Murray elsewhere
 
On the minus side:
The impressed marks on the bottom are post war
It doesn't have the red KM stamp
 
I've priced it reflect this uncertainty.