Related Clues:

• Literally, 'great O'
• Greek horseshoe?
• End of an alphabet
• Greek alphabet ending
• Luxury watch brand
• Seiko rival
• Zee : English :: ___ : Greek
• Alpha's complement
• 'Phi, chi, psi' follower
• Z's Greek counterpart
• ___-3 fatty acid
• The end, to Aristotle
• The last watch you'll ever need?
• The end?
• First watch on the moon