The Sanabria Catalog lists airmails and semi-official airmails, worldwide. These are essays (or facsimiles) from among Sanabria France #314-321, a set of 8 labels issued in September, 1922, for aviation meeting(s) at La Baule-St. Nazaire and La Baule-Bourget.
They have no denominations (at lower left), so they are not the actual stamps, which were printed in color, not black on white.
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