Citizen Promaster BN0150-28E

The Citizen Promaster BN0150-28E runs on Citizen's proprietary Eco-Drive solar-charging movement, which converts both natural and artificial light into energy stored in a rechargeable cell. This is consistent with the majority of watches in the Promaster Diver line and means it never requires a routine battery replacement.

ISO 6425 is the international standard certifying a wristwatch as a true diver's watch, requiring it to pass specific tests for water resistance, legibility in darkness, bezel functionality, and resistance to magnetic fields and salt water. The BN0150-28E carries this certification with a 200-meter water resistance rating.

Many watches in the Citizen Promaster BN0150 series come equipped with mineral glass crystals rather than sapphire, though specific configurations can vary by market. Mineral glass is more shatter-resistant than sapphire, which some divers consider an advantage for a tool watch, though it scratches more easily.

Both lines offer ISO 6425-certified diver's watches, but Citizen uses its Eco-Drive solar movement while Seiko Prospex models typically use mechanical automatic movements such as the Seiko NH35. The Citizen requires no battery changes or manual winding, while the Seiko appeals to enthusiasts who prefer a traditional mechanical movement.