An affordable example here in this 60's era restrike of the US Yangzte Service Medal. Clutchback example marked by unidentified maker "P-30." Other examples from this maker do exist on the internet, also unidentified, but dated to the 1950's/1960's. Condition is as depicted in photos. 
 
The Yangtze Service Medal is a decoration of the United States military which was created in 1930 for presentation to members of the United States Navy and United States Marine Corps (and to a lesser extent, members of the United States Army). The Yangtze Service Medal is awarded for service in the Yangtze River Valley between the dates of September 3, 1926 and December 31, 1932, a period of significant unrest in the region.