Sample 1: L1A1 Snap Closure Double Pouch
Cotton canvas material. Each side of the pouch holds a single SLR (L1A1; British FN FAL rifle) magazines for a total of two.
Stamp:
Stamp says “CN/X/11871 LPG 4338”. “X” could mean “experimental” and “LPG” could mean “Local Pattern Germany” (source: http://www.karkeeweb.com/patterns/1958/components/component_np_local.html) although many of these and similar pouches were used far away in Borneo (1963 – 1966) and the Falklands (April – June 1982), possibly even in Aden (Yemen). Kharkee Web’s quoted information about a pouch with the same stamp indicates it might have been in circulation as early as the Malayan Emergency (1954 [when L1A1 was adopted] – 1960) (source: http://www.karkeeweb.com/patterns/1958/components/component_np_local.html).
Similar pouches have been found with “Singapore” written on a manufacturer’s tag (source: https://www.facebook.com/rustysraiders/photos/1867702410079486).
Pouches Opened:
Snaps:
“Tiger AHK” on inside of female side of snap.
Belt Loop:
The upper part of the pouch is meant to slide over the belt. This was so that the pouches would not get in the way of a loaded vest or pack worn above the waist for carrying supplies on long range patrols, a feature that was carried over to the later Pattern 58 SAS drop loop pouches (source: http://www.karkeeweb.com/patterns/1958/components/component_sas.html).
Usage Photos:
L1A1 Snap Closure Double Pouch:
British SAS:
The most famous users were the British SAS, particularly in Borneo.
Royal Marines Commando:
Falklands War. 
1970’s. Note Pattern 59 Denison smock on the left and WW2 style Pattern 46 (?) on the right.
These pouches also appeared in a few photos of Royal Marines from the 1970’s and during the Falklands War (April – June 1982).