Royalty Free Stock Retro Clipart of Whistles

1. 

   Retro Steam Whistle
2. 

   Retro Silhouetted Referee Umpire Blowing a Whistle over a Blue Banner
3. 

   Retro Silhouetted Referee Umpire Blowing a Whistle in a Blue and White Shield over a Banner
4. 

   Retro Silhouetted Referee Umpire Blowing a Whistle in a Red and White Shield over a Banner