Original U.S. WWII Silver Star Set With Pin & Proper Presentation Case Japanese Edged Weapons HALPRO was quickly diverted from

HALPRO was quickly diverted from its original mission to a new one: interdictory raids from airfields in Egypt against shipping and North African ports supporting Axis operations as part of United States Middle East Air Forces (USMEAF) on 20 June 1942

so it may have gotten wet during service

And on the left barrel:

plus three rows of lemon-yellow (signal corps) wool piping (Waffenfarbe) around the circumference

Original U.S. WWII Silver Star Set With Pin & Proper Presentation Case Japanese Edged Weapons HALPRO was quickly diverted fromOriginal Items: Only One Set Available. The Silver Star Medal (SSM) is the United States Armed Forces' third highest military decoration for valor in combat. The Silver Star Medal is awarded primarily to members of the United States Armed Forces for gallantry in action against an enemy of the United States. The set includes the original SILVER STAR MEDAL marked case with a matching lapel device and ribbon. All items appear without extensive damage and