378787
The treaty port of Weihaiwei used revenue stamps from 1921 to 1930 .
 location: Weihaiwei
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Weihaiwei 
Answer:
 location: Weihaiwei