This is a new bar.  Replaceable Tip bar, manufactured by Oregon Branded Poulan Pro.  This bar replaces the Oregon bar number 328RND007.  So this is a D007 mount pattern.  This bar is the .404 pitch .063 gauge bar.  That is a larger chain than most standard saws run.  Some of the saws this will fit include,

Pioneer: Farmsaw, Farmsaw II, Farmlite, P20, P25, P38, P39, P41, P42, P45, P50, P51, P60, P62, 515, 970, 072, 1073

Poulan PRO - 404, 455, 655, 525, 505