The Stovebolt Site Forums The Shop Area General Truck Talk What does this VIN mean? (1949 3800 I think)

Need a translation for the VIN: 3GS-A-1381

I know it’s a one ton from the 3800 on the hood but I’m not understanding the 1949 Chevrolet truck information pages I downloaded from the GM history site.

My dad purchased the truck used in 1978. Has a hydraulic bed and sides to haul grain & animals which we did until he didn’t need it anymore.

Any help would be much appreciated.

Don