Stamps, Stack laboratory design
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Sudan
postage1951, Sep 1 1951 issue wmk. mult SG p. 13
| X | 10p | grn & blk | Stack laboratory | .20 |
official
1951, Sep 1 1951 official issue ovpted
| - | 10pia on 10p | grn & blk | Stack laboratory | .20 |
1 to 2 of 2
| X | 10p | grn & blk | Stack laboratory | .20 |
| - | 10pia on 10p | grn & blk | Stack laboratory | .20 |