Opening in the middle is 10 mm on the end links
Note: The Original second hand has the same shape which has a circle on the top of the second hand
it is for 19 mm lug and opening is approximately 6 mm
New Mineral Glass Crystal For Seiko 6106-7440 6106-7447 it is a Low dome top flat
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NEW Mineral Glass Crystal Seiko 6106-7440 6106-7447 Low Dome W Blue AR Coat Opening in the middle isNEW Mineral Glass Crystal Seiko 6106 7440 6106 7447 Low Dome W Blue AR Coat This item will fit on Seikos with Case number. Seiko 5126 6030, Seiko 5126 8080, Seiko 5126 8090, Seiko 5126 8120, Seiko 5126 8130,Seiko 6105 8000, Seiko 6105 8009, Seiko 6105 8110, Seiko 6105 8119, Seiko 610 6050, Seiko 6106 6059, Seiko 6106 6057, Seiko 6106 6060, Seiko 6106 7110, Seiko 6106 7117, Seiko 6106 7119, Seiko 6106 7420, Seiko 6106 7440, Seiko 6106 7447, Seiko 6106