The BOR was common on the 166.010, I believe there are a couple on the forum now. That particular model dates to the late 60’s and even though the 5 row BOR is more commonly associated with the late 50’s early 60’s and the 7 row was for the Deville’s of the same era, that one took a 5 row. You just need to make sure you have the correct endlinks which I think was the 512. Perhaps
@Lucasssssss can chime in with the exact bracelet combo that works on this shape case.
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