Rare Vintage Mexico Knight Helmet Poison Sterling Silver Statement Adjustable R

Absolutely fabulous Vintage Mexico knight helmet sterling silver poison adjustable statement ring. 
A very rare to find this sterling silver Locket / poison ring with secret compartment, breath taking design with knight helmet shaped. 
Set with exquisite ornate silver carving the craftsmanship and quality is divine. Extremely rare one in a million poison ring. 
The hidden compartment is hinged and has a fold over lock snaps open and shut securely with safety hook. 
 This classic ring face measures 7/8”inches width by 3/4”inches tall . 
Total weight: 9.59grams. 
The ring is adjustable and currently is a size 7, but could be smaller or larger and in good vintage condition with fully hallmarks: MEXICO,STERLING, and some marks I can’t figure out, please see the details on the picture. 
Excellent vintage condition. 
 This cool knight helmet ring would look great on your finger or be a present for your family or friends.