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Colt SAAs of that period had tapered front sights. Later guns had even sides and a flat top, giving the now-standard "Patridge" sight picture. AFAIK, no bead or special sights were put on standard guns, but buyers of Bisleys could order special sights.
It looks to me like that sight was reshaped by or for someone who wanted "a fine bead" in the terminology of the day.
Jim
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