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Metrosert 100 - First Day Cover
Metrosert 100 - First Day Cover for only GBP £1.39
About Metrosert 100
The ‘Metrosert 100’ stamp being issued on World Metrology Day on 20 May 2019 is dedicated to the centenary of Estonia’s Central Office of Metrology and to the redefined SI base units coming into force on the same date.