SPT has a limited number of Main Springs for the Copal No. 0 and also for the Copal No. 1 Shutters.
These are ORIGINAL MANUFACTURE Main SPRINGS .. not weak knock-offs that may be available elsewhere. Supply is limited to stock on hand.
We may or may not be able to resupply … availability is very limited … no longer manufactured.
Copal #0 and Copal #1 ... have a limited supply!
First come / First serve.