The Seiko Caliber 7S26A is visible through the case back. It’s unadorned, like the task oriented should be. It’s not meant to be pretty. It’s credentials; however, are worth a watch. It has 21 Jewels, a 21,600 bph beat-rate, Seiko Diashock anti-shock measure, a power reserve of 41+ hours and surprise, surprise….a magnetic resistance of 4,800 A/m i.e. 60 gauss! It makes the Seiko 5 Automatic 21 Jewels Men's Watch ISO 764 compliant. However, the movement doesn’t allow hand-winding or hacking seconds.
http://watchessingapore.bloguez.com/watchessingapore/6097030/Seiko_5_Military_Automatic_Nylon_Strap_SNK803K2_Men_s_Watch_You_just_Stumbled_upon_something_Great#.WqoeeLO-nIU
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