What stamp for my Balance

Question

Trying to match replacement spring/balances

Following website instructions shows I need style S385 but I cannot tell which weight. The existing unit indicates:
25 4 Caldwell DM. Which specific model do I need?

Thank you

Emily · Accepted Answer

Hello!

If you're sure you need the S385 and your stamp reads "25 4", then you'll need a spring strength option of 2540.

When measuring your balance, make sure to include only the metal channel in your measurement. Your stamp is "25 4" which means your metal channel length should measure 26".

If you have any further questions just let us know!