James, yes are wax seals..i have some Guatemala registered with wax seals also...i do not know yet what the SS stands for but I would not be surprised if one of our experts told us !!
I'm a little curious as the the dates it appears that it was entered at Buenos Aires on July 29 and received into New York registry on August 21. Doesn't that seems to be a long time spread for a registered cover? Very nice markings and seals.
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