Hi Pete,
I really don't know. Steel is a bit easier to obtain than brass, but don't know if the Swiss encountered supply problems during any of both wars. Steel is also cheaper, so it might have been just a budget decision somewhere along the road. They also did their best to cut costs on Swiss Parabellum production, so I'm thinking towards that direction.
Both the lid and the body have Swiss cross marks.
Mauro:
I did get the gentleman's address, as he had quite a bit of nice Swiss trinkets lying about.
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