Help with an Omega Seamaster 2576 On 1506 bracelet

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Thank you, you explain everything so clearly and make it easy for me your been a great help I really appreciate it.
 
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the bracelet with 1506 clasp and 16 endlinks appear to be matched and period correct for speedy cb-66. similar to my cb-66.

however, the highly filed endlinks to fit the shorter lugs space of a seamaster substantially reduced the value of the bracelet.