This is a USA Purple Hearth with marineclasp, it can be dated to around 1943. Marineclasps are hard to find on these early PH’s.
On the reverse the Purple Heart is named (and engraved) to: M. P. Keller.
In Original coffin type case and with two ribbons (on for the buttonhole on the lapel of a suit).
Very rare to find and in very good condition.
This set deserves to be further researched!