Hi Aldo,
There was no separate machine gun ammo, it was a 'one size fits all' solution, apart from the fact that the P08 didn't like steel cases. A fix was sought and found but never really implemented on a large scale.
The crate and the larger boxes have become even more collectible than the small 16-round boxes, while most buyers simply discarded and burned them.
The crates are indeed lined with Zinc. I've seen several versions: Some are soldered shut, others have a rubber gasket around the edges of the lid. Any labels on the crate itself?
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