1917 antique makeup compact / cut glass set in sterling silver

Description

1917 antique makeup compact / cut glass set in sterling silver. I had it checked out by my local gemologist,  unfortunately they are all cut glass stones but they are set in sterling silver and unlike anything they had ever seen before.  It is marked on the inside ( pat. Date April 24 - August 14 - 1917 ) so it is early 20th century,  it has MMDs on the tag of the application cloth .
2.5 " wide
.75 " thick
Double compartments and in very good working order , snaps shut securely and the Hing is not loose at all, the mirror is not terrible but has a few issues.  See photos
Not sure were it was made but it is very rare that I am sure of , a truly unique piece perhaps one of a kind ?
Thanks for looking folks and happy shopping!!