The Citizen Aqualand was launched in 1985, I don't know if it was continuous, and it has been updated a couple of times, but I'm sure the Fugu has been as well. The current Aqualand (JP2000-08E) is ISO 6524. So for quartz ISO rated divers they probably hold the crown too.
"The international diver’s watch standard ISO 6425, which largely complies with the DIN standard 8306 specifies which requirements a professional diver’s watch must meet.
However, very few manufacturers have their watches certified according to the standard.
Waterproof up to 200 meters or more, only a full hundred values are allowed.
The preselected time period and the second hand (or other function control) must also be visible in the dark.
The watch must be antimagnetic in accordance with DIN 8309: After the influence of a magnetic field of 4800 A/m, the deviation must not exceed 30 seconds. per day.
It must also be shock-resistant in accordance with DIN 8303: after impact at 4.43 m/s, the deviation must not exceed one minute per day.
The watch must survive 24 hours in warm salt water without visible traces.
The closed bracelet is loaded with 40 kilograms for one minute without loosening or bending.
The crown is loaded with 0.5 kilograms from above in 25 percent of the specified depth for ten minutes. Afterwards, a Condensation water test.
At a depth of 30 centimetres, the watch is set to 40 degrees for ten minutes, then ten minutes at five degrees, then again for 10 minutes at a temperature of 40 degrees. 40 degrees Celsius. Then the condensation water test.
The watch must spend 25 percent of the specified depth for 1 hour, then 1 hour at 0.3 bar vacuum. Afterwards, the following occurs a condensation water test.
Condensation water test: The watch is heated to 40 degrees. Then one minute a cold, damp cloth or a drop of water is applied to the surface of the fabric.
the glass. After wiping dry, there must be no condensation on the inside. DIN 8306, unlike ISO 6425, places demands on accuracy: e. g. average deviation between -4 and +6 seconds/day. (for chronometers). DIN 8312 other mechanical watches < 90 sec. /day. Only when the watch meets these 12 criteria does it qualify for ISO 6425 certification!"