On 1 December 2023, Bulgaria issued a souvenir sheet containing one stamp to honor the 140th anniversary of the establishment of its Hydrographic Office. The stamp depicts Sveta Anastasia Lighthouse which is located on an island offshore from the port of Burgas. There is also an image of a Fresnel lens on the sheet.
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Thanks to Jaap Termes and Michael Ellison for information about this issue.
See more lighthouse stamps from Bulgaria here
