Can't determine weight of window for balance

A quick learner from Portland, Or says:
I have a sash with the #s 25 3 BN Caldwell,on them.

The metal part of the sash is 26" long and looking at your catalog it appears to be your # S385-26. But I have know way of knowing the weight #. this is a double pane vinal window which I cannot get out of the frame.

Frame size 20 3/4w x 28 3/4t x 1 3/4 thick.

Any ideas for me?
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Tom from SWISCO responded:
Thank you for posting. Based on your stamp, I think you may want the 2530 stamp option. This can carry a window sash weight range of 15 through 19 pounds. However, I highly recommend that you weigh your window sash just to make sure.

Take a look at this handy tutorial video that details how to replace your window balance. The very beginning shows how to remove this type of sash. It may shed some insight for you.
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