Related Clues:

• Not found in many stamp collections, say
• Awfully bloody
• Like hurricanes in January
• Very, very occasional
• Word that's music to a collector's ears
• Numismatic classification
• Very pink
• Beef order
• Description on many eBay listings
• One in a million, e.g
• Not garden-variety
• Slightly cooked
• Like some sightings and steaks
• Order to a chef
• Especially good branches of British army