Hi i have a 1958 b31 that i have just aquired and on the inside of the toolbox there is a 3"×2" plate tack welded on which has Fire Pump House J650 stamped on it. I think it will be a plant or equipment number. Does anyone have any ideas as to where it might be from? There is no indication on the log book and the previous owner doesnt know Cheers Shedman