When we refer to Japan and its watch industry everyone, and rightly so, instantly think of one company: Seiko. However, there is more than that. Although Seiko has produced a large number of excellent, iconic and historical timepieces, it is unfair to forget other companies like Citizen. In this article we are going to examine one of the most iconic dive watches coming from Japan of all time.

No, it is not the or the Seiko 6105, but the iconic Citizen Aqualand Promaster. Background – Citizen’s History The Citizen Watch Company was established in 1918, as the Shokosha Watch Research Institute and, in 1924, it produced a pocket watch which Mr. Shinpei Goto, the Mayor of Tokyo, named the “CITIZEN”. After this, the name stuck and was adopted by the company in 1930. From that point onward, Citizen Watch Co. Have been producing extremely fine and innovative watches.

For example, in 1959, the company created the first Japanese water-resistant watch, the “Parawater”, while in 1962 they developed the world’s thinnest 3 hand watch. In 1970, they introduced one of the world’s first Titanium cased watches the “X-8 Chronometer”, while in 1972 they presented the 60’s “Sports Master”, which we all know as the Bullhead. This model showcased Calibre 8110, which included a zero-position reset mechanism fitted with a shock absorber. One of Citizen’s first pocket watches that went on sale in 1924 In 1973, the company launched its first quartz wristwatch, while two years later, in 1975, the launch of the now legendary Crystron Mega Quartz left the watch world with little, if any, doubt about where Citizen were heading as a brand. Fitted with caliber 8650, generating a frequency of 4,194,304Hz, it is still to date one of the world’s most accurate wristwatches ever offered for public sale. Johnson Matthey Gold Serial Number Lookup here.

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Descargar Opera Mini Yandex Apk more. By the end of the decade, Citizen was producing excellent watches that many times, I would dare to say, were more technically interesting than the offerings of its rivals. For example, towards the end of 1981, Citizen released its 1300m Professional Diver’s watch.

At that time, it was the world’s most water-resistant watch available for public use. A few years later, in 1985, Citizen introduced the world’s first watch fitted with an electronic/digital depth gauge, the “Sport Depth Meter”. However, before we proceed with our analysis of the Aqualand we must make a necessary detour. The concept of Depth Gauge on dive watches While diving, there are three vital parameters: the diving duration, the diving depth and the orientation of the diver.

In the early years of scuba diving, a diver would strap his dive watch on one arm and a bulky depth gauge, accompanied by a compass on the other. Accordingly, he would compare the watch and his depth gauge as he calculated his no-decompression time while submerged. Favre-Leuba, Nivada and Aquadive tried to abolish the usage of an independent depth gauge by developing dive watches that incorporated the depth gauge into the watch. However, these models were extremely complicated and their mechanical nature, or its electromechanical nature in the case of the legendary Aquadive Time-Depth 50, meant they were too complex and needed more maintenance than the usual mechanical dive watch. Furthermore, readings were not that accurate, so divers in some cases stopped using them or used them in redundancy with a dedicated (and known reliable) depth gauge. Therefore, the all mechanical dive / depth gauge watch pretty much eclipsed from systematic usage despite the fact that,, Jaeger-LeCoultre and still produce some models, which I do consider marvels of mechanical engineering. However, these are more technological exercises rather than watches that can actually be used in the real world.