I found nothing

A quick learner from Nebraska says:
May 17, 2020
No markings found.
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Bob from SWISCO responded:
May 19, 2020

Can ell us the length of the metal channel? Can you also confirm the exact weight of the window sash? Many thanks. 
A quick learner from Nebraska says:
May 20, 2020
I did find some markings! Yeah! See pictures.

21B and some other markings that probably mean more to you than me.

I also sent you a picture of the back pulley system.
Sash weighs 15 lbs.
Metal channel measures 21" x 9/16
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Bob from SWISCO responded:
May 21, 2020

Thanks for getting back to me, that's perfect. Your balance will be a custom made 21" Series 795 with a stamp option of 21B and with the 15-224 Inverted Link attached. I am sending you an email with a custom link to order (2) of these balances. Let me know if you have any other questions prior to ordering. For your pivot shoe, see our 15-216, sold separately. 
T-Lock Pivot Shoe
T-Lock Pivot Shoe
15-216
$2.55
Inverted Link
Inverted Link
15-224
$0.95
21" Series 795 Channel Balance
21" Series 795 Channel Balance
S795-21
$13.12
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