I just picked this up and would like to know exactly what it is and when it was made. On top of the barrel is "SMITH&WESSON SPRINGFIELD MASS,U.S.A.PAT'DJAN24,65 JULY11,65,AUG24,69 REISSUE JULY25,71 MAY11,80JAN3,82". It's a 5 shot with a 3 1/4 barrel. It has some nickel plating left and the...