These measure approx. 3/4", and are marked HICKOK, USA. Please note there is some wear to the bottom paint. Please note: One of the shafts on the back on one of the cufflinks is bent, is not loose, but is bent. Please look at all photographs, as they are part of the description and ask any and all questions prior to looking. Thanks! Launched from my store - Powered by Highwire.com Track Page Views With Auctiva's FREE CounterEvery buyer gets a MyStoreRewards invitation for cash back