1990 Marvin double hung window

I'm not sure what you have, unfortunately. We have dozens of different balances with that stamp. It's not a product code or anything, it just indicates the strength of the spring.

In order to figure out what Series this is, I need you to remove an undamaged version of this balance from the window and show me clear pictures of the top and bottom ends and whatever shoe or clip is at the end of the cord. Please let me know if that would be possible.