POSTAGE DUE (026338)

POSTAGE DUE (026338)
unsealed envelope bearing 4 x 5c on 5pf (SG2, Mi2) from boxed "Etappen-Inspektion / Gent" datestamp, may have had unpermitted content (paperclip and perhaps attached note) and treated as underpaid, oval "Porto" cachet, blue manus "T", first charged 25c due, then corrected to 10c

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