Wow.. check out these tiny petrol lighter cuflinks that actually work.
The cufflinks are made from lighters that were once dispensed in gumball machines around 50 years ago and are now collectors items.
The lighters have a screw bottom to (re)fill with lighter fluid and each lighter is only 7/8 inch tall by 3/4 inch wide and 3/8 inch thick. unfortunately they are sold out at Etsy at the moment
"I will include extra flint and wick and it comes in my signature gift tin. Each cufflink has a bullet back enclosure so you can slip it into the smallest of buttonholes or the largest and still have it lock into place when you flip the bar horizontally."