Royal Observatory Greenwich – postcard collection
Estimated date
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1960–62
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Publisher
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Anonymous: attributed to Ministry of Works / National Maritime Museum
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Publisher's title
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Time Ball and 24-hour clock, Old Royal Observatory, Greenwich.
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Nominal size
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6.0 x 4.0 inches (real photograph)
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Publisher/printer ref.
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Card 91
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Website ref.
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PC0204
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