5 @ 39 c. in sheet, town of Leiden.
On the sheet margin, at right of the bottom stamp, is the skeleton of Archaeopteryx or of a small theropod, see detail.
The designer probably included this because 'Naturalis', the national Natural History Museum, is located in Leiden. I have mailed the design studio to ask them, regrettably I did not receive a reply.
Issue date: 1-st of February.
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2390 |  |
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90 |  |
1240 |
