Hi All,
Does anyone know what the dimensional size of a Gruen 731CA mainspring?
Thanks Mel

Is that caliber the Auto model Melvin?

Hi Bila,
Yes it is an Autowind.
Mel

Hi Mel:
I think Dennison W=4
S=10
L=12 1/2
I Think if you check listing # 114852423269 on e-bay site you might find what you are looking for,or a least someone there that might help. John

Thanks John!!!!!