The base G-Shock Frogman watch is probably the most expensive G-Shock that Casio makes costing over $1,000. It is a highly sophisticated model in terms of extra durability with a metal inner case and lots of functions. This limited edition of 300 pieces that came out a few months ago arrived with a retail price of 300,000 Yen – which is just over $3,600 right now. Limited edition watches always go for more than the watches they are based on, but not that many of them retain collector’s value after they are sold. Some models do in fact remain highly sought after collectibles. This model is lucky to combine love for G-Shock watches, the Tokyo FM radio station