Ken, the note is confusing. But what makes you think Belgium? As far as I know neither the Netherlands or Belgium ever used an "S" as an abbreviation for their money.
The only reason I think Belgium is because these were in a large group of unusual Belgium material. I think it comes from the Leo Malz stock and most of this material seems to be correctly identified, other than that I have no idea.
That's the Belgian lion crest alright, and during that period it was known as the Austrian Netherlands. So these do look like stamped revenue paper cutouts from the period.
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