fake that I bought on 12/2018 (and was refunded for):

https://www.ebay.com/itm/382661401879



listing 2019/01/14, sent seller a message:

https://www.ebay.com/itm/192789165601

(the year printed on the coin is Meiji 45, aka 1912) Thank you for posting the weight. (19 grams) The "416" on the coin indicates the expected weight, in grains.  If you google for "how many grams in 416 grains" google will convert that for you (about 26.95 grams, very close to 1 oz) which is the expected weight for this coin.  Most of the modern reproductions for this coin are the correct width and thickness, but only weigh about 21 grams, and are made of brass.  These copies will pass a magnet test because they're brass instead of steel, but have a yellowish color rather than the expected silver or grey.  19 grams is a little light for the more common brass alloys, but your coin certainly looks yellow.  What you've got there is definitely a reproduction: it's not very old and certainly doesn't contain any silver. (900 refers to the expected 0.900 percentage (fineness) of silver, the remaining normal alloy for this coin is 0.100 copper, to harden the metal for durability in circulation)

It's an ok looking reproduction, (and might even be considered "rare"?) and you might even get something for it, but if you list it as authentic, the winner may not realize it's a knockoff and complain when they receive it.  But you shouldn't trust everything you hear from random people on ebay ;)  Google for "meiji silver 1 yen" and go to one of the numista or ngccoin links to verify the correct weight for this coin.