I have a 28mm f2.8 in very good condition, UV filter, front and rear caps. Don't know if it's MC or not, serial #247043 if that helps. Doesn't say MC on it anywhere. $50 plus shipping.
I did a little more Googleing on the lens. All the f2.8 are MC. This is a later version and by then they dropped the MC on the front of the lens.