Channel Balance 2730 & 2740 BSI

Thanks for reaching out! I am confident that there is a replacement balance we can recommend to you, however I'll need a bit more information to confirm the correct recommendation.

To start, the photos of the bottom shoe are helpful but I'll need a photo of the top attachment to determine the correct series. 

In regard to the stamp, are both of these from the same window? If so, I'll need to know the exact weight of the sash to determine which of these is the best option. They each have different weight ranges, so you'll want to make sure that both are the same on each side to prevent one balance from wearing out faster than the other.

Thanks for the photos. It appears you have the S395-28 channel balances with a winged top and a non-winged bottom. 

If each of the stamps that you've confirmed have come from the same window, you'll want to confirm the exact weight of your sash. You'll need the 2730 stamp if it weighs below 19lbs and you'll need the 2740 stamp if it weighs above 19lbs.

However, if these are from two different windows, you can disregard the suggestion above.