Related Clues:

• The conclusion
• Greek alphabet's conclusion
• Final letter of the Greek alphabet
• Greek character held by loathsome gang
• NASA-approved watch brand
• Corporation that began as the Waterbury Clock Company
• Sorority "O"
• Luxury watchmaker
• Old giant, Greek character
• Letter from Greece, and some from e.g. Argentina
• Love neat last letter
• Homeric character, nothing great
• Character has ring that's enormous
• Ultimate Greek character
• Counterpart to alpha