As often, Wikipedia proves to be less than exact...
Chatellerault is an average town, home of the Descartes family and was famous for the high quality cutlers since the 13th century (several hundred before the Revolution, producing expensive folders, switchblades and "prostitute daggers"); the town was an important "Post" station half way on the Paris - Bordeaux road and many cutlers sold their knives to travellers.
To have an idea of the high level of quality achieved :
https://www.lecouteau.info/couteaux-régionaux-traditionnels/les-chatellerault/les-couteaux-poignards/
(the second part, after "Ailleurs aussi . . ." deals with imitations.)
The number of cutlers declined during the 19th century. But the defeat in Waterloo showed that the weapon manufactures situated in the East were too easily endangered and it was decided to create the
Manufacture d'Armes de Châtellerault (MAC). Many skilled cutlers came (good and steady wages, many social advantages, a good health service, the Manuchards as they were called could retire at 50 after 30 years of work), this led to the quick demise of smaller shops. Until 1830 the Manufacture was specialized in "armes blanches" (knives, swords, etc.) achieving both high quality and great quantities (8000 workers during WW1, the most important weapon factory in Europe).
(all pictures © https://www.lecouteau.info/)
Today, the only Chatellerault pattern still available is the "sword-knife" (second from the top) and is made mostly in Thiers (only one cutler left in Chatellerault).
The pattern has been used in Thiers by Bargeon and many others for several sizes of automatics (I bought mine in 1970) also in Italy, a mix of Chatellerault and Genoese stylus. Winchester also had a similar pattern with a clip.
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The Admiral d'Estaing (no link with a former president, whose family bought a title of nobility, one was near the King of France at Bouvines) was a French noble of a very old family originating from the Aveyronese town of Estaing (# 25km of Laguiole, 10km from Espalion).
The English Navy keeps a painful souvenirs of his campaigns against her ships as a privateer during the war in India... He was less successful during the US Independance War.
He is reputed to have ordered a folding dagger he could use for dinner and hunting as well.
To close this pedantic speech, imho these may well be considered as traditionals, even if I'm not very fond of them.