Dave Sr. from SWISCO responded:
October 17, 2016
The two operators are very similar, but do have subtle differences. One easy way to confirm is to look at the corner of the glass in the sash see if the date is etched there. There may also be a tag somewhere on the window that tells you its age.
|
Dave Sr. from SWISCO responded:
October 21, 2016
Thanks! Yes, I believe it could be January 1st, 1997. If so, we recommend the 39-343.
|