You've got the knockoff Zippo, an IMCO Streamline 6800, and an old Bic lighter with an adjustable flame. I've got a few more on the way from Ukraine so I'll share those when they arrive
It sometimes leaks gas because the o-ring in the top valve is too old and tough (I have it going well rn but I've brought some more to replace it) but that's easy to replace. However when I refill it there's quite a bit of blow back no matter what adapter tip I use so I'm wondering if there's supposed to an insert in the refill valve. Also I'm just wondering if there are any parts that may be missing based on photos.