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postage

1978, Jun 1 unwmk (no perf info)

-

0.50b

Mount Illimani

-!-cyan blue | dark gray blue!

1978, Jun 1

-

1.00b

Pre-Columbian Monolith

brown | ocher

1978, Jun 1

-

2.50b

World Rheumatism Year, 1977

red | violet blue

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