Phill,
I have two of these both with serifs, the one on the left came from a respected eBay dealer described as WW2, this is similar to your example. The one on the right is tighter trimmed with slightly narrower wording, this was bought from a trusted dealer who said it came from WW2 collection, they are most likely from different manufacturers and as Jerry says about the gauze they may be from different periods.
I have no concrete provenance and would be interested myself if anything stands out as WW2 period (difficult I know)
Paul
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