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on 4c and 10c Trans-Miss 
MAY 22: MANILA to SINGAPORE Large black "R" killers on 4c x 2 and 10c Trans-Miss issues. Mil. Sta. No. 1, Philippine Isls, San Francisco, Cal. / REGISTERED postmark in purple alongside. 18c Proper Double Civilian Mail Registered Rate (10c postage + 8c registry fee). |
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