Peter, the details are correct as per the original computer printed label:

1240-99-964-9272
POUCH SIGHT 055874A
Qty ea
REQ NO. 048/75308
RCR 952
17 JUN 88

This label has then been covered by the NZicon stores computer label stating:
POUCH SIGHT
REQ: 23/05/93
1 BSB
QTY: 1
1240-99-964-9272

The detail for the NSN number (and in fact any NSN number) can be found at this website http://www.iso-group.com/NSNIndex/1280/1280.aspx

or this link http://www.iso-parts.com/Public/Sear...40-99-964-9272