Tom from SWISCO responded:
July 29, 2020
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 nylon fittings. I will also need to know the dimensions of these fittings. |
Tom from SWISCO responded:
August 3, 2020
Thanks! Based on your photos, you have either our S380-26 or S385-26. The only difference between them is the size of the bottom fitting, which is indicated on their respective store pages. You'll need to measure your bottom fitting to confirm which one is the better match. Comparison of the S380 and S385 balance shoes.
Concerning your other balances, assuming that the top and bottom nylon fittings are identical to what you show here, then you still need to figure out the length and the stamp. Removing those balances from the window will be necessary to get that information. The video below should help you to that end. |
Tom from SWISCO responded:
August 4, 2020
No, the numbers 7 and 10 don't have any relevance. They're just manufacturer branding. The only numbers you should be concerned with are the first three, which are "25 5" and "25 4," respectively. That would mean the stamps you want on our balances are 2550 and 2540. |