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Cuba

postage

1975, Mar 15 Cuban minerals unwmk p. 12.5

X

13c

multi

copper

Mongolia

2017, Apr 30 Traditional 9 Treasures of Mongolia issue (no perf info)

-

400t

multi

copper

Sierra Leone

2017, Mar 30 Minerals 2017 issue p. 13.25

-

9800le

multi

copper

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1 to 3 of 3