4137
His father , a German immigrant and traveling salesman working for the Hamilton Watch Company , is off on long trips from which the boy cannot be certain he will return .
 organization: Hamilton Watch Company
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Hamilton Watch Company