✅ SOLVED I dug this flat button today with an interesting back mark

[Jyverb64]

I'm just wondering from where it was made and age

 

Amazon Forum Fav 👍

Treasure of Victoria Peak - Grab it through Amazon!

[fyrffytr1]

Ne Plus Ultra is a quality backmark. It is from the Latin and means roughly "the highest quality". I am guessing it is a plain front? Most likely a civilian button from the early 1800s. I would like to find one.