War Grade bottle top find

Whilst out walking today, I found several of these ‘war grade’ bottle necks and screw-in stoppers. They were on the edge of a ploughed field alongside a public footpath.

What does ‘war grade’ refer to? To glass? The stopper, or the contents. I’ve been hammering Google to try to find out.

Sadly, I haven’t come up with much. The stopper is probably made from some sort of recycled plastic due to shortages of other materials during WWII.

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