A distributor from Dallas TX says:
March 4, 2015
This is Kerfed in weatherstrip that goes around a casement window that was manufactured in either 1998 or 1999. I'm a dealer for Weathershield and it's not ours. I saw a Pella picture posted by one of your customers and it looked pretty similar. I need about 300'. Thank you.
Dave from SWISCO responded:
March 9, 2015
Take a look at our 58-055 off-set bubble. It comes in a brown color. I have used this in casements windows in the past with success. Do you think you could use it as a substitute for your own sample?