I believe the left bushing has rotated out, and the hole may have been peened at some time previously to prevent it. About 1895 a copper alloy set screw was added to prevent the problem.
The bushing needs to be flush or it will crack.
The bushings were discontinued about 1905 but have been found on later guns which presumable were assembled with earlier frames.
BTW the Syracuse Grade 3 was listed at $100 = about
$2,775 today.