What You Need to Know: After years of analysis, Microsoft co-founder Paul Allen's team discovered the wreck of the Japanese battleship Musashi in 2015, 3,280 feet deep in the Philippine Sibuyan Sea.

The glass case back gives a view of the 21-jewel, Myoto M09F automatic mechanical movement within. This is not a Swiss movement, but at this price you knew it wouldn’t be. It’s Japanese and ...