Mainspring - 909-912A

909 Mainspring for American Wall clock loop end 3/4" x 0.18" x 96" (8 days)
910 Mainspring for American wall clock, loop end 11/16" x 0.18" x 96" (8 days)
911 Mainspring for American wall clock loop end 5/8" x 0.18" x 96" (8 days)
911A Mainspring for American wall clock ¾" X 0.165" X 170" loop end (31 days )
912 Mainspring 30- hour loop end 3/8" x 0.14" x 48"
912A Mainspring 30- hour loop end 5/16" x 0.15" x 42"