Hi, I recently bought a lovely pair of vintage lever back earrings. I was happily surprised to find a stamp on the inside. I have researched but cant seem to find any info on it. It says OV 19K. My research has led me to believe they might be Portuguese but I really don't know. Any ideas/help would be appreciated.
The Portuguese gold standard is 19K (actually 19.2), or 80% pure gold, and is sometimes marked "800." If you could post a close-up with better detail it would help.