Lee Enfield n°4(T) and Bipod

So finally, I get some pictures of the bipod.
On one of them, we can see that this rifle is equipped with a solid block band foresight. I'm surprised by the gap in between the front sight and the forend. My 2 Enfield don't have so large gap.

Attachment 69561 Attachment 69562 Attachment 69563 Attachment 69564

This n°4 T has the TR on the butt socket, the left side of the receiver is damage by a long stay in a attic for 30 years and the T is not visible. the S51 and the S are stamped on this rifle.
The scope number doesn't match with the number stamped on the butt.
So what kind of bipod it is? Is this bipod contemporary of the rifle?