The Lum-Tec M54 Chronograph Watch features the LUM-TEC MDV Technology 8 layer vintage tone luminous application with Japan Sii NH35 automatic movement. The special solid CuSn8 Bronze case will develop a patina over time; each case is unique and will tarnish differently. This corrosion actually protects the metal underneath. It can be polished back to new or take on its own unique character.
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