Series 370 2830 balances but unsure about the series

Question

The photo of the balance number contains a unique marking after the number. The house was built in the late 1980s. I suspect the balance is a series 370 2830. Can you provide me some ideas if this is the correct part?

Thanks
Kevin

Bob · Accepted Answer

Thanks for posting. While I agree the top attachment looks like it might belong to a Series 370 Channel Balance, I really can't say for sure without seeing the balance removed from the window, with pictures of both the bottom and top attachments. You will also want to confirm that the metal channel, not including the end attachments, is 29". If so, then you would want the S370-29, with a stamp option of 2830.