Maxillaria variabilis. Well-established blooming size plant in a 2" pot. Here is a link to the amazing website orchidspecies.com for more info and pics.
This is a great little plant! Super easy to grow and very forgiving. Likes temps from cold to hot, doesn't mind drying out a little between waterings, likes bright light and produces bright yellow nickel-sized flowers randomly all year long. What's not to like?