Specialised mint/used/mnh collection with many expensive issues, starting with Japanese occupation incl. proofs, many different overprints on many different values, also Japanese occupation of other countries, interim period with most of the scarce stamps of Java & Madoera, also proofs, imperfs and varieties, Sumatra incl. many better stamps and overprints, housed in doublethick stockbook. Very good collection with very much scarce and sought after material!!
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