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postage
1966, May 26 independence b issue ovpted on stamp of British Guiana wmk. St Edwards crown & CA p. 14
| X | 24c | org & blk | ovpt, mining for Bauxite & Queen Elizabeth II | .20 |
1967, Oct 3 ovpted on stamp of British Guiana (no wmk info) (no perf info)
| X | 24c | on 24c (21) | .20 |
1967, Dec 22 ovpted on stamp of British Guiana wmk. St Edwards crown & CA p. 14
| X | 24c | org & blk | ovpt, mining for Bauxite & Queen Elizabeth II | — | — |
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