The stamp on this postcard is a Belgian King Albert I definitive stamp with the famous Sunday Delivery Label still attached. The stamp depicts King Albert I of Belgium (reigned 1909–1934). At the bottom is a perforated tab that reads:
- French: Ne Pas Livrer le Dimanche
- Dutch (Flemish): Niet Bestellen op Zondag
This detachable tab is one of the most distinctive features of classic Belgian stamps. Belgium delivered mail seven days a week during the late 1800s and early 1900s. Many people objected to Sunday mail delivery for religious reasons, believing postal workers should have Sunday as a day of rest.
The Belgian Post Office solved the problem by adding a perforated label beneath each stamp.
- If the sender wanted Sunday delivery, they tore off the tab before mailing the letter.
- If they did not want Sunday delivery, they left the tab attached. The post office would then hold the mail until Monday if it would otherwise arrive on Sunday.
- the tab is complete,
- it is tied to the postcard by the cancellation,
- and it demonstrates the postal service's unique Sunday delivery option.
- StampData. Belgium – 10c Stamp of 1912 (King Albert I). Describes the 1912 issue, denomination, color, date of issue, and design details.
- LastDodo. King Albert I – Belgium, 1912. Provides catalog information for the King Albert I definitive series, including designer Eduard Pellens, printing method, perforation, and notes that the stamp was issued with a tab.
- Robin Hood Stamp Company. Belgium Stamp Listings. Includes the 1912 King Albert I definitive set with Sunday Delivery labels and earlier Belgian issues with Sunday delivery labels.
- UPA Stamp Auctions. Belgium 1912 King Albert I Set with Sunday Delivery Labels. Auction catalog describing the complete 1912 King Albert I set issued with Sunday delivery labels.
- Slania Stamps. Belgium 5 Centimes, 1912 with Imprint. Explains the bilingual inscription "Ne Pas Livrer le Dimanche / Niet Bestellen op Zondag" ("Do Not Deliver on Sunday") found on Belgian stamps with attached tabs.
- Reddit – r/philately. New in My Collection. Collectors discuss the history of Belgium's Sunday delivery labels and explain that the tab remained attached if the sender did not want Sunday delivery, while it was removed if Sunday delivery was acceptable








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