I know it's hard to see because the guy doesn't have a very good pic of the handle or the front, but this is a Dole Citation.
The Selmix Regent used a totally different valve on their machines and you can see the different drip pan grate. The Regent handle is slightly different and the valve protrudes forward rather than recessed into the bottom.
You can see the grate has rounded corners where the Regent is square. Dole and Selmix were essentially one in the same and the machines were very similar.
I'm no expert on pricing but my max on this would be $150 with all the missing pieces, complete maybe $250 It is in very nice condition otherwise, but then again I'm cheap. I would need to see a picture of the front though.
http://soda-machines.com/index.php?option=com_content&task=view&id=36&Itemid=20