Right so im selling a copper zippo and there is a lot of interest in it, how rare are these, mine is stamped D 03? Why are copper zippos so interesting? i guess

a few on ebay are going for a high price about 50ish to 200USD in mint condition. I know copper is hot with EDCers and the patina on mine is uniform and the liner has no dents. it actually came with a tool chest i bought and sat there for years but i need the money for other EDCstuff and i dont use zippos. Also to my knowledge it has never been polished.