Paul from SWISCO responded:
May 16, 2017
Concerning the channel balance, I'm not sure what you have based on this information. The 1810 marking only indicates the spring strength calibration. It's not otherwise used for identification. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.
As for the spiral balance, can you confirm the diameter of the outer tube? Old wood windows usually have balances with a 5/8" diameter. |