Where can you find serial numbers for western field shotguns?

Trying to find serial numbers for a western field shotgun would prove to be very difficult.There were many makers of shotguns for the montgomery wards company.some of these include mossberg,savage,stevens,and noble.It would be best if you include the western field model number of your shotgun and then we can convert that number to the original maker of your shotgun.Then we would be able to find the makers model number.You must remeber that prior to the gun control act of 1968 weapons were not required to have serial numbers on them.