I'm assuming that the 492xx numbers are also 49235 which is the serial number.

The meaning of S9184 is less certain without looking at the gun or pictures. I suspect it is a Springfield Armory rebuild number required on all guns returned to a Government armory. The number should have been stamped on the frame, barrel, cylinder, and all major internal parts. If you pop the side plate, you should find the same number on the hammer and trigger. Usually, rebuild numbers are bigger than original numbers on the gun. A refinished surface is another clue, although not all guns were refinished during a rebuild.

If you can post some good pictures, we can sort this out.

Buck