I like to collect the ORGINAL Zippo special the Zippo during Vietnam war era.But,I have the probem that  7 out of 10 which sells on Ebay  is FAKE. Some the cover outside is REAL, but the inside is FAKE. ( you see  inside it's almost NEW  and the words " Flints and Fluids"is not sharp.).The second thing to help you to know who REAL? .who FAKE?.The bigger is REAL  ,the smaller  is FAKE. For that reasons, it's better to buy the zippo with the ogrinal box (90% is authentic).To make sure before bidding ,you should ask the seller  about the AUTHENTIC of the zippo,If you get NO ANSWER or they say THEY DON'T KNOW????, DON'T BUY IT. It's 90% FAKE. GOOD LUCK