10 inch balance spring
A home owner from California says:
May 9, 2016
The metal part is 9/16" x 5/8" x 10" long
Paul from SWISCO responded:
May 10, 2016
This balance will have to be custom made due to its especially short length. That shouldn't be an issue, but before we go any further I would like you to confirm the size of your bottom shoe. It could either be our 15-004 or 15-005, but since yours is broken I'm not sure which. You can use an undamaged balance for reference.
Please also tell me how many you will need.