Tim,
The top of the numeral "4" is normally open on stamps of this vintage... and since this one isn't open, but closed, I think this stamp was applied at a much later time than the time of manufacture...
just my 
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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