Jaeger LeCoultre® calibre # 9RD yoke spring - Fits calibers: 10RO, 408, 417, 428, 461, 471, 472, 473, 474, 475, 9RD, 9RO Omega® 245 Back Opening Bellow 10 cm

Back Opening Bellow 10 cm makes the authentic "cuckoo" sound from a Cuckoo Clock

They have an overall length of 5 ½” (14cm) and the length of the cut is 1 9/16” to 2 9/16”

30 mm are refills for assortment 64-30130

PVC Watch Strap Keeper Assortment contains 3 black strap keeps for each of the following sizes: 16 mm

Jaeger LeCoultre® calibre # 9RD yoke spring - Fits calibers: 10RO, 408, 417, 428, 461, 471, 472, 473, 474, 475, 9RD, 9RO Omega® 245 Back Opening Bellow 10 cmJaeger LeCoultre yoke spring, part # 440, calibre # 9RD yoke spring to fit Jaeger LeCoultre calibres: 9RD, 9RO, 10RO, 408, 417, 428, 461, 471, 472, 473, 474, 475 *Perrin Supply Ltd is independent of and not affiliated with or sponsored by Jaeger LeCoultre. Jaeger LeCoultre warranty does not apply to parts supplied byPerrin Supply Ltd. Using generic parts may devalue your watch.