The serial number is 51C###X which would make it a 1943 Savage, so this is a possibility. If so, it was fully refurbished and stamped 1945 at LB.
Interestingly, it seems LB liked to fully scrub down their refurbs and mark them as their own. Not the case with other factories who seem to have just added their own stamps to the original ones. Perhaps a LB policy or maybe a point of pride, who knows? Does anyone own a LB reburb that has origins at another factory? If so what factory, and did they scrub it down complete minus the serial number, or do any have LB markings added to the original markings?
Out of interest, does anyone know when LB purchased all of Savage's stock of No4 bits?
It seems as if LB refurbished a lot more Savage rifles than rifles from other manufactures and I'm guessing that ties in with the purchase of Savage parts.