São Tomé and Príncipe, catalogued and sold in the trade as St. Thomas & Prince, has a new 50 dobras commemorative banknote, reported by two catalogue services on 21 August 2026 and carrying the date 2025 on the note itself (BanknoteNews; MRI Bankers’ Guide). It is printed in green and gold at 145 x 67 mm by De La Rue, and MRI records the occasion as the fiftieth anniversary of independence, gained from Portugal on 12 July 1975. The back carries something unusual for a commemorative: an aerial view of the archipelago with the equator drawn across Ilhéu das Rolas, and a reference to the survey that established the line runs there.
Who Reported the Note, and What the Central Bank Has Said
Two catalogue services published on the same day, and they complement each other rather than conflict. BanknoteNews carries the design inventory, the dimensions, the printer and the reference B316a, but never states what the note commemorates. MRI Bankers’ Guide supplies the occasion and its own reference STN50.2, citing the Banco Central de São Tomé e Príncipe, but none of the physical detail.
The central bank itself has published nothing. Its news feed on 22 August 2026 runs to treasury bond announcements, and its currency pages still describe the pre-2018 family of 5,000 to 100,000 dobra notes. That silence matters, because much of what a collector wants to know sits in documents the bank has not released.
What the 50 Dobras Commemorative Note Depicts
The front is a portrait of the islands as a living place. BanknoteNews records:
· Portuguese text and the national coat of arms
· Rei Amador, leader of the great slave revolt of 1595 and a national hero
· A peregrine falcon and a grey parrot, Psittacus erithacus
· Ferns, forest foliage and a waterfall
· The denomination in optically variable ink, shifting from gold to green
· A cocoa pod serving as the registration device
Two of those terms are worth unpacking. Optically variable ink changes colour as the note is tilted, an effect microscopic layered flakes produce and scanners cannot reproduce. A registration device is printed half on the front and half on the back, aligned so the halves complete into one image only when the note is held to the light. Here that image is a cocoa pod, the crop that made these islands the world’s largest cocoa exporter by 1905.
The back turns from the islands to their position on the globe: an outline map of the Americas and Africa with the equator drawn across it, an aerial view of the archipelago with the line falling on Ilhéu das Rolas, the Marco do Equador monument, ferns, and the second half of the cocoa pod.
Why the Equator Runs Across the Back
Ilhéu das Rolas is a small islet off the southern tip of São Tomé island, with a population of 76 at the 2012 census. The equator crosses it, and the note credits the reason: the geodetic and astronomical work of Carlos Viegas Gago Coutinho.
Gago Coutinho, 1869 to 1959, was a Portuguese naval officer and cartographer better remembered for the first aerial crossing of the South Atlantic with Sacadura Cabral in 1922. He headed the geodetic mission to the islands from 1915 to 1918, mapping at 1:25,000 and delivering his report in 1919. That survey fixed where the equator crosses the archipelago, and the point was given his name in 1923.
The Marco do Equador marks the spot. Erected on 26 July 1936 by public subscription in the colony, it is a pedestal supporting an armillary sphere on a broad polychrome base bearing a world map, and it is documented in the HPIP heritage inventory. An inscription once kept inside recorded that from Gago Coutinho’s work between 1916 and 1918, it was concluded that the geodetic equator passes through this point. The monument has since fallen into advanced deterioration.
Telling the Commemorative Apart from the Circulating 50 Dobras
The two 50 dobras notes are easy to confuse. A regular 50 dobras already circulates, and it is exactly the same size, 145 x 67 mm.
Colour separates them cleanly. The circulating note, catalogued B311 and widely sold as P73, is brown, carrying the butterfly Charaxes lemosi, the coat of arms and the Banco Central headquarters on the front, and a stylized cocoa pod, the map of the country and the São Tomé weaver on the back. The commemorative is reported green and gold. A further trap sits in dealer listings: the circulating note was reissued with a new date and signatures in July 2024, so stock is often described as “50 Dobras 2024/2025”, which reads like a new issue but is not.
Where the Note Fits in the Dobra Story
The dobra was redenominated on 1 January 2018 at 1,000 old dobras to 1 new dobra, under a decree of 16 November 2016 that also changed the ISO code from STD to STN (Banco Central de São Tomé e Príncipe). Both families circulated together until 30 June 2018, and old notes remained exchangeable at the central bank until 31 December 2019.
The new family runs 5, 10, 20, 50, 100 and 200 dobras. The 5 and 10 were originally issued on polymer and the rest on paper, but the island climate wore the polymer down. Paper versions followed, catalogued as identical to the originals except for the substrate (BanknoteNews), and De La Rue records them entering circulation on 26 August 2021. The dobra has been pegged to the euro at 24.5 to 1 since January 2010, under a cooperation agreement with Portugal.
One detail gives this issue real weight. The central bank’s own published history of the country’s notes and coins, running from 1977 onward, contains no commemorative banknote at all. São Tomé and Príncipe has a long record of commemorative coins in gold, silver and cupronickel, but on the published evidence no anniversary has previously been marked on paper rather than metal. Several African issuers have taken that step recently, among them Botswana with its 50 pula commemorative.
What Collectors Should Know Right Now
A great deal about this note is genuinely unknown.
1. Substrate is unconfirmed. BanknoteNews lists it as unknown. Given the move away from polymer in 2021, that is an open question rather than a formality.
2. Mintage is unpublished. No print run has been confirmed by the issuer.
3. Issue price and distribution are unpublished. The roughly US$2.40 figure quoted alongside the note is a conversion of face value, not what anyone will pay.
4. Legal tender status is unstated. The bank’s organic law covers commemorative issues, but no issuing instrument for this note has surfaced.
5. Availability is thin. As of 22 August 2026 the note has no Numista entry and no general dealer stock, and the few listings that have appeared are on backorder.
The working identification checklist is short: green and gold, 145 x 67 mm, prefix A, dated 2025 on the note, with an introduction date of 21 August 2026 as recorded by BanknoteNews. Physical description is the safer guide here, because BanknoteNews has published the reference B316a against an earlier 200 dobras note as well.
Frequently Asked Questions
What does the São Tomé and Príncipe 50 dobras commemorative note celebrate?
MRI Bankers’ Guide records it as commemorating the fiftieth anniversary of national independence, which São Tomé and Príncipe gained from Portugal on 12 July 1975. BanknoteNews describes the design in full but states no occasion, and the central bank has published no announcement of its own.
Is the São Tomé and Príncipe 50 dobras commemorative note legal tender?
No source states it either way. The organic law of the Banco Central de São Tomé e Príncipe gives the bank exclusive power to issue notes including commemorative ones with legal tender, and requires each issue to be approved by government and published in the official gazette. No issuing instrument for this note has been retrieved.
How is the commemorative 50 dobras different from the circulating 50 dobras?
Colour is the reliable separator. The circulating 50 dobras, catalogued B311 and sold as P73, is brown and carries a butterfly and the central bank building. The commemorative is reported in green and gold, with Rei Amador, island wildlife and the equator design. Both measure 145 x 67 mm, so size will not separate them.