Related Clues:
- Something unusual
- One-of-a-kind find, to Caesar
- Uncommon occurrence
- Roman birdwatcher's find?
- 78 speed records, e.g.
- Uncommon creature
- It occurs once in a blue moon
- Uncommon thing
- Diamond value factor
- Seldom-seen thing
- Quite a find
- It's seldom seen
- Something seldom seen
- It occurs infrequently
- Something very scarce and valuable