Possible Clues:

• Noisy timekeeper
• Noisy timepiece
• Souvenir of a Black Forest vacation
• Crackers and jam welcoming cold caller on the hour
• Aviary timekeeper?
• Peak of Swiss achievement (according to Harry Lime in 'The Third Man')
• Bird call timepiece
• Timepiece featuring bird
• The world's largest ..., in Wilmot, Ohio, unleashes mechanical Bavarian dancers hourly
• Its door always opens at 9 a.m