Sherman Senator Genuine Onyx Cufflinks Vintage

These are amazing, really the most stunning cufflinks I have seen. They each are stamped. "SENATOR PAT. PEND.". They have a pretty thick Oval Onyx Stone on each cufflink. They are beautifully gold toned. By the design on the back of cufflinks we can say they were made after the patent pending of these which is approximately 1957. From having these for years I believe they were made 1960s/70s. Just stunning!! These would make an amazing gift!!