Not an Albatros, but here's a bonus clue and today's regular clue.
Looking for the name of a warbird.
1. Only one built.
2. But that one was used in a war, though not in the role it had originally been designed for. It served for several years, unlike most one-offs.
3. Its design included advanced technology for the time.
4. But because of long development delays it was inferior to other similar aircraft that were already in production by the time it first flew.