Regulator ROYAL MISTRAL, commercialized between 1963 to 1985

In 1963, out of the workshops of the Spiro the regulator ROYAL MISTRAL, "son of MISTRAL 1961". It takes the new hoses and the evolutionary version of the mouthpiece AQUASTOP released in 1962, with the tip upwardly offset, greatly improving the comfort in the mouth thanks to the chinstrap thus created. New clamps with stainless steel screws are also created to fix the ligated hoses.


The regulator bowl is completely redesigned:

- No more round holes of exhalation, but flat holes with edges limiting the intrusion of foreign bodies which could damage the membrane.

- New manufacturer's label without rivet, as in the USA.

- Inside the mechanism is the same as the MISTRAL, except the nozzle of the venturi effect has been modified following the evolution of the volume of the bowl.

We can see 2 generations of Royale Mistral, the first (1963 to 1979) with the crown plate (Photo 1) and the second in black (1980 to 1985), without the COUSTEAU-GAGNAN anotation but just with the logo and the name of the spirotechnique in yellow (Photo 2).


Photo 1


Photo 2

In 1963, the first Royal-Mistral came out without HP output for manometer.

They are recognized because they all have a small serial number (probably less than 10 000) and their nameplate has a navy blue color and a strong yellow crown (Photo1).

Note also that a PRO Royal-Mistral version has been marketed, as can be seen in the catalogs of the time (Photo 3).

Around 1967 the label came out with a blue-gray color and a yellow "piss" probably following a change of subcontractor from the Spiro (Photo 4).

The SPIROTECHNIQUE will also decide around this period to export its regulator by attacking the German and Anglo-Saxon market. It will be released for this purpose a DIN version (Photo 5) and an I seat (international diameter 17.8mm) for the English market.


Around 1971/72 and until 1979 the Royal Mistral plate changes color again, with cyan blue and the crown with a primary yellow (Photo 6).


Photo 3


Photo 4


Photo 5


Photo 6

From 1976, in order to modernize the regulator, the Royal-Mistral comes out with a 6/100 HP output in France (Photo 7), the versions with or without HP output have coexisted until 1979.

In parallel, the German and English versions will be given a male HP output with imperial thread (Photo 8).


It is possible that the latest French series are also released with HP output in 3/8, but no certainty to date (Photo 9). (For the record, the 3/8 is used nowadays for Low Pressure outputs and High Pressure Outputs are 5/16.)


Photo 7


Photo 8


Photo 9


Photo 10

In 1980 the Royal-Mistral saw its nameplate change radically following the abandonment by the SPIROTECHNIQUE of the mention COUTEAU-GAGNAN on its regulators. It takes again that of the regulators "series" released in 1978 such as the 20, 25, 40 and 50. This version also called second generation or "black label" in the North Atlantic came out in principle only with a HP 3/8, but I I found a version in 6/100 (DIY home impossible to know because it also likely that the SPIROTECHNIQUE had fun marketing some models in 6/100 following a customer request ...)

In any case this model of Royal-Mistral will be the last product because in 1985 its commercialization will be stopped, too expensive and less powerful than the new generations of mouth regulators arriving on the market and in December 1991 the Spirotechnique will put an end to the sale of all spare parts (Photo 10) .... the end of an era.

Royal Mistral Regulator

First generation with a navy blue and a deep yellow color label, at least up to serial number 9335.

Royal Mistral Regulator

First generation with blue-gray color label and yellow piss

Royal Mistral Regulator

Second generation with HP output

Serial number at least until 55729

Royal Mistral Regulator


This royal-mistral was intended for the training of the French army. It is a late version of the early 1980s made by SPIROTECHNIQUE at the request of the army. Made in small series the mouthpiece used is that of "submarine product", the same used for Mistrals and royal-mistrals sold by BEUCHAT. It is quite possible that the Spirotechnique sold these regulators based on the stock planned for Beuchat when it broke its commercial agreements with the firm to Swordfish.

It is without manufacturer's label.

Royal Mistral Regulator

PRO version

As explained previously the SPIROTECHNIQUE released a PRO version in the years 1963 until 1976, mounted simply with a PRO tip knowing that late around 1975 a version of the tip PRO is out in AQUASTOP with tip or mask version PHOQUE.


Released in 1963, the clamp with screw and stainless nut will be abandoned in 1976 by the use of plastic collar.

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