Yt:FR 998
Stamp: France – Centenary of the Metric System – 30 francs, grey‑black - Issue date: 6 October 1954
Postmark: Paris – First Day of Issue cancellation – 4 OCT. 1954 - Date: 4.10.1954, applied two days before the official nationwide release
Postcard: Monochrome printed postcard depicting a detailed image of the terrestrial globe that served as the historical reference for defining the metric system’s unit of length. (Edition unknown.)
Concordance
Thematic: Full thematic concordance.
The stamp commemorates the Metric System, featuring symbolic scientific imagery, and the postcard illustrates the original terrestrial globe used in the development of the metric system’s foundational unit.
Both elements relate directly to the same scientific and historical theme.
Geographic: Strong geographic concordance.
The stamp is a French issue, the First Day cancellation was applied in Paris, and the postcard depicts an object central to French scientific history, created under the direction of the French Academy of Sciences during the birth of the metric system.
All components share a consistent French cultural–scientific context.
Temporal: Excellent temporal concordance.
The cancellation date—4 October 1954—corresponds to the official First Day of Issue applied at the Paris philatelic office.
Although the general nationwide issue date was 6 October 1954, French postal practice allowed First Day cancellations to be used prior to the commercial release.
This complies fully with maximaphily guidelines and forms a true First Day maximum card.
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