The Gadsden flag is a historical American flag with a yellow field depicting a timber rattlesnake coiled and ready to strike. Beneath the rattlesnake are the words Dont Tread on Me [sic]. Some modern versions of the flag include an apostrophe in the word "don't" like these cufflinks. 

Winner bidder: Please pick up this item at the event. If you are the winning bidder and did not attend, this item can be shipped to you for an added $8.