1920s D and L Engraved Gold Filled Locket

Marked 1/20 12K GF.
Also marked D and L.
Engine turned pattern.
Snaps nicely.
Interior has one insert but no celluloid.
Engraved: To C.H. From Mary Suzanne.
Engraved side has roughness.
Roughly one hundred years old.
Fair condition.
Measures approximately 1 1/8ths inches in diameter.