A handy person from Illinois says:
May 30, 2016
Window Bottom Bubble Seal. Unsure of name brand of window. Measurements are included on the picture. Looking for an exact match or something that will fit the same dimensions and provide a seal.
Dave from SWISCO responded:
June 1, 2016
Your bubbleseal is not familiar to us, I'm afraid. It's strange that it has a double kerf. Take a look at our 58-114 and see if this could be a possible replacement.