41 cal., serial number marked on cylinder release - 968, marked on bottom of grip strap - top line 112 and below that is 976, 4 1/4" barrel. This qualifies as antique and does not require ffl paperwork.

Additional comments added on 1/27/2021: This does require an FFL unless you can provide proof that it was manufactured after the cut-off date. We have researched it and cannot fine proof that it is post cut-off Functions with light wear and surface rust