The basic design was based on the Wyon
City medal of 1837 which is based
on a sitting when princess Victoria was 15 years old.
On British postage stamps the Queen never gets older.
Head from the silver Wyon City Medal
Design of Queen Victoria's head on British postage stamps
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| 1840 | 1847 | 1855 | 1857 |
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| 1868 | 1872 | 1877 | 1880 |
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| 1881 | 1882 | 1883 | 1887 |
For more on design of GB stamps go here