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Aqui....http://www.telemundo.com/shows/2010/03/02/bienvenidos-caso-cerrado

The Seiko Tuna is sacred ground to geeks and a rathole to others. This article, however, is for everyone. The hope is to provide insight into the history link of all monocoque Seiko link Tuna models, link starting with the 1975 reference 6159-7010 and finishing with the SBDX038 and SBBN047 of today.

Brand NorqainModel Freedom 60 GMTReference Number link NN2100SGB21120EO.18S steel black dial and NNZ2100ZGN21520EO.18Z bronze limited edition Diameter 40.5mmThickness 14.5mm link Lug to lug 49.2mmLug width 20mmCase Material Steel or bronzeDial Color Black or brownIndexes AppliedLume Super-LumiNova "Old Radium"Water Resistance 100 metersStrapBracelet Leather link strap or optional steel bracelet for the steel model.