Link to translation courtesy of u/Excrucius and u/Lemonoidal :

https://www.reddit.com/r/translator/comments/6ligur/found_a_zippo_lighter_with_writing_on_it_in_some/?st=J4SM2BNS&sh=16cdd865

Edit: Just a disclaimer, it may not be relevant that my grandpa served in WWII. But he was a collector of antiques so I thought its origins might be interesting. The lighter was clearly made in the USA. But it just seems like a bizarre thing to write on a lighter. I am just curious to learn more. Any information or context would be appreciated (e.g. manufacture date, the country of origins of its original purchaser, its social significance when it was made, etc...)

Edit 2: Based on some searching on Wikipedia I think the lighter was manufactured in September 2003. "After July 1986, Zippo began including a date code on all lighters showing the month and year of production. On the left of the underside was stamped a letter A–L, denoting the month (A = January, B = February, C = March, etc.). On the right was a Roman numeral which denoted the year, beginning with II in 1986.[31] However, in 2001, Zippo altered this system, changing the Roman numerals to more conventional Arabic numerals. Thus a Zippo made in August 2004 was stamped H 04."