Vintage B.U.M. Equipment Men's Red Dial Date Indicator Watch - Corrosion - READ

Needs a new battery and band. The watch has corrosion. It needs cleaning. The band is super small and is broken. I don't know if the previous owner of the watch tried to make it into a ring, lol. It looks odd. There are scratches on the crystal and case. It's a casual preppy style. Please view the photos. Thank you!