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