British Ebay plate dealer worldplateuk buys and sells a lot of plates on Ebay. He buys many and puts extra stickers on them that were never there in the first place.
This is a batch he bought from a seller of genuine Mongolian plates based in Mongolia. The versions here without stickers are as sold from Mongolia and the modified versions are after being doctored by worldplatesuk. These are all older series Mongolian plates and they never had the Syombo symbol or MNG when these plates were made. These are just cheap stickers he has added so if you were unlucky unough to buy one, take off the stickers and you will have a very real MNG plate.
He also like to put flag stickers on many plates that never had them originally from many different countries.