Mystery 1958 Pattern Era Nylon Pouch

Picked this up cheaply in a rummage pile at the War & Peace Show:

Attachment 74577Attachment 74574Attachment 74576Attachment 74573Attachment 74575

It measures approx W15cm, H10cm and D5cm. I assume it's for carrying something relatively delicate. There are no visible markings. Mildly interestingly, it seems to have the same brown cloth trim found on the 1970's Mk2 S6 respirator haversack.

Construction-wise it is very similar to an obscure padded nylon variant of the 1958 Pattern compass pouch which I believe dates from the 1970's:

Attachment 74578Attachment 74579Attachment 74580Attachment 74581

Both pouches are a dark olive green colour rather than the grey suggested by the pictures.

So, does anyone recognise it or have any ideas what it's for?

Cheers,
Mark

The NSN, if that is what it is, stamped inside the second pouch would be a clue to its origin. Other countries used the same hook system for their webbing.