Offered here is a mint and tropical Croton Chronomaster Aviator Seadiver chronograph, circa 1960s. This chronograph was produced by a few different brands (e.g., Nivada Grenchen), and used a variety of different movements. This example is powered by the Valjoux 7733. The case is unpolished and razor sharp, with original beveled edges present. The dial is perfect, with no flaws, and has aged to a nice brown color. The original tritium lume is present in both hands and dial, aged to a yellow color, with only minor cracking in the hands, visible only under a loupe.