BTW there isnt a premium for 1880 O small o/ medium o varieties. Ive even noticed dealers asking $150 for AU 1880 small o. They refer to it as a micro o to hype the coin and possibly decieve uneducated buyers. Neither size MM is rare per se & BEWARE of sliders for 79-80o a chunk of them circulated briefly and went right back to the bank vaults.
Some are. Some aren't. 1899 has authentic micro-o's for instance and those are all top-100's. The 1880o's have medium & "small" o reverses. Some of the small o's are "list" vams but not all. The op coin appears to be a medium o