I was a marvel of engineering in my time, designed for a specific purpose that I fulfilled for a short while. My existence was brief but impactful. I am known for my unique silhouette, and my name is tied to a celestial phenomenon.

1. My construction was completed in the early 20th century.
2. I was not a commercial vessel, but a military one.
3. My primary function involved the observation of other vessels.
4. My design was quite unusual for the time and made me recognizable.