Vintage or antique cufflinks by Britannic, London, UK measure about 3/4" by 1/2" with 1" bullet backs. The doublet or triplet opals measure about 10 by 8 millimeters. The brightest, firiest opal has a small chip to one edge. The other opal has some light scratching. One of the backs is slightly bent, but they are still perfectly functional. The combined weight is about 10.5 grams, so they are fairly hefty. See photos for more details.