Unknown 20mm? Ammo box I.D. request

[Quatermass]

A friend recently acquired this ammo box, it appears to be for 20mm ammunition? Do any members have a positive I.D. on the box, nationality, date etc.

Dimensions L 50cm W 20cm H 22.5cm inner 18.9cm

Any help would be greatly appreciated.

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[Quatermass]

More pictures.

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[Quatermass]

More pictures.

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The pictures!

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[reccetrooper]

See this thread for another example of this box design. (Originally sold on eBay UK I think)

http://www.bocn.co.uk/vbforum/threads/97060-Unusual-metal-box