Matt's inquiry on the dimensions of the prize door got me curious and to thinking. So, using Mr. B.'s 9x12 board trilon dimensions and Hugh Downs as a constant, I took screen caps from kinoscopes and made some size grids. I know these aren't exact, but I think I came up with numbers that are pretty close. Using this method, each prize door comes out to 17 1/2" wide. The margin along the edge from where the two doors meet in the middle is about 2" wide, the prize and name slats are 12" wide and the door margin closest to the wall is 3" wide. The name slats appear to be 4" tall while the prize slats are 3" tall. That would make sense since Mr. B. said he never used a font smaller than 3" and the lettering pretty much fills the full height of the slat. The spacers between the name/prize slats and the wall margin as well as those between prize slats appear to be about 1/2". Again, just a fun way of making an educated guess. I, too, would like to add that, for those of us into the minutia of game shows and their set-ups, this has been a facinating thread!! And..admit it! How many of us who grew up with the show had a pair of wooden louvred doors in our house that we..at least one time...tried to turn into Concentration prize doors? (c'mon...get em up!!!)