Looks like there is a lot of info on the Potthast Brothers online.
http://www.chipstone.org/publications/2000AF/2000Arthur/ArthurText.htmlhttp://www.mdhs.org/library/fotofind/PP0007fa.htmlI wouldn't call it Colonial. Based on the feet, I might call it Empire Revival (or a revival of the Empire Revival given the time frame, so to speak). I'm really not sure what folks call the style of these expandable dining room tables. I would guess that this table is ca. 1910, but this is just a guess as the makers seem to have really been into reproduction-type styles.
- Jason