South Bend White Alloy Mainspring JA-600
$34.95
JA-600
Size 18, factory # 19528, width in mm 2.95, strength in mm 0.195, length inches 21-1/2, end T For 18 size models 304, 305, 309, 312, 323, 313, 327, 328, 329, 330, 331, 332, 333, 337, 340, 341, 342, 343, 344, 345, 346, 347,
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South Bend Blue Steel Mainspring JA-602
$8.00
JA-602
Size 16, factory # 27528, width in mm 2.8, strength in mm 0.19, length inches 21-3/4, end T For 16 size models 203, 204, 207, 211, 212, 215, 217, 219, 223, 227, 229 Only Blue Steel Mainsprings are available for South Bend
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South Bend White Alloy Mainspring JA-603
$34.95
JA-603
Size 12, factory # 55528, width in mm 1.98, strength in mm 0.175, length inches 19, end T For 12 size models 407, 411, 415, 417, 419, 429, 431, 419
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