Oh my...they were a B-Day present from the Mrs. I showed her the cuffinks and asked where did she get them. My Queen replied that as far as she remebered, she picked them up at a cigar shop in Lafayette, LA many 'moons' ago (and of course she asked "Why do you ask?...to which I said, "Because one of my B & B buddies wanted to know" ).I collect cufflinks (to the extent that SWMBO lets me) and those are SPECTACULAR. I see you live not to far from me, so it's only fair to warn you that if I spot those links cuffed up in public, I may try to talk you out of them.
How old are they and where did you get them?
That said, I'm sorry I can't find any more info, but I did find a online site that sells the same cufflink with the swivel bar vs. the 'bumbbell' type (like mine). With more researh, you might be able to find a set.
http://www.justcufflinks.com/cucicu.html