 The most advanced techniques in horological engineering produced a truly one-of-a-kind timepiece; only one watch was ever built.Complications included a perpetual calendar with phases and age of the moon, indication of sunrise and sunset, and a celestial chart depicting the stars in the nighttime sky over New York City.Graves died in 1953.His heirs sold the watch in 1968 to The Time Museum in Rockford, Illinois, which closed in March 1999.