Not sure this would apply to the first stamp, but the second stamp has "IPEU" at centre, which was the International Photo-Engravers Union of North America. Such Defense Fund stamps were used as receipts for special assessments above and beyond the monthly dues, and were attached to the worker's membership booklet or card. For more on some early IPEU stamps, see the article "Union Dues and Assessment Receipt Stamps" by R. Riley in The American Revenuer (vol 19, No. 2, #172, page 15-16) which is available online.
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