JC Higgins / Schwinn hybrid

[TRM]

Got this yesterday. Looks like someone did some fork swapping many years ago.
Can anyone help with the serial numbers? Looks like MOS-L but then below that looks like MOD.

 

[Adamtinkerer]

1947 Murray built JCH, 'MOD 502' is just code for Murray built, '221' is the model #, which is different than the Sears' catalog #, which is stamped on later bikes.