1.) Short Stout Woman was Paty in Green =  8
2.) Planky Peter's Hat was The Left Over Hat in Yellow = 6
3.) The Simple Hat was First Mate McGee's in Red = 5 
4.) The Largest Sailing Ship was the Royal Titan in Blue = 9
 
The lock from left to right goes RED, GREEN, YELLOW, BLUE.  

Red = 5, Green = 8, Yellow = 6, Blue = 9
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ANSWER: 5869