What makes Aquastar dive watches unique?

“Aquastar invented the no-decompression bezel in 1962, a patented dive-planning tool still on every Deepstar today. The brand built the first Swiss 500-meter dive watch (Benthos, 1970) and was chosen by the French Marine Nationale for its combat divers from 1979 to 1984. Every Aquastar is built in Switzerland.”