Just to wrap this up - No less an authority than Roy Jinks has confirmed that the serial number in my case is the 49235 and the 6184 is the assembly number. Both numbers are needed and should match to affirm that the piece is all original.
The "s" on mine is the inspector designation, Colonel Gilbert H. Stuart, Inspector for Army versions.

Thanks again to those who answered me, and especially to those who "nailed" the answer.