Coil balance identification

A quick learner from Aurora, Colorado says:
I have removed the coil balance from the window and would like to order new ones. I looked at them and am seeing a D on one of the plastic piece and N on the other plastic piece. On the other balance, it has A on one & F on the other plastic.

Both balances' metal coils have a 6 marked on them.
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A quick learner from Aurora, Colorado says:
Now the tricky part is that the coil stamp could be a 9 and look like a 6 when inverted.
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Steve from SWISCO responded:

Hello, thank you for posting!

Please take a look at our Series 152 Coil Balance with the 15-175 Pivot Shoe. I believe that the stamp on the coil is a 9. To confirm this, you can weigh your window sash. If the sash is 24 pounds, you will need 6 pound coils. If the sash is 36 pounds, you will need 9 pound.

Thank you,

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