Bulova MIL-SHIPS-W-2181
Here is an extremely rare piece, the Bulova Mil-Ships-W-2181. This watch was an experimental design that never actually went into production, other than the handful (supposedly around half a dozen at first) of original test pieces sent to the military for testing in the field.
After the military passed on the production of this model, the test subjects were given to divers in the Navy for regular use.