Stamps of Colombia, Opening of the Paz del Rio steel mill issue
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postage
1954, Dec 12 Opening of the Paz del Rio steel mill issue unwmk p. 13
| X | 5c | ultra & blk | Paz del Rio steel mill |
airmail
1954, Dec 12 Opening of the Paz del Rio steel mill issue
| - | 20c | grn & blk | Paz del Rio steel mill |
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