If it was manufactured before 1969 it didn't need one and probably doesn't have one. If there is a serial number, it should be someplace visible without disassembling anything.
I have a Western Field 565 R pump. A number was engraved on the underside of the barrel near the receiver. The number on mine is 126 001. Not sure if it means anything.
The number that you listed for your Western Field shotgun is the serial number,not the model number.We would need the model number to give you some idea of the age of your shotgun.
Your shotgun was made by savage/stevens for montgomery wards(westernfield).
Go to Numrich Gun Parts Corp.It will be helpful if you know the original maker of your shotgun,as all guns that were made under the Western Field name(Montgomery Wards) were made by outside firms for Montgomery Wards.If you list the model number of your western Field shotgun,this can be cross referenced to the original maker and help you get the right model of shotgun to locate parts.
To locate a manual for your shotgun,you must provide the model number for your shotgun first.All shotguns made for Montgomery Wards(Western Field) were made by other firearms manufactures for Montgomery Wards to include Savage,Stevens,Mossberg,Noble and more.
The Western Field model 600 ERI shotgun was made for Montgomery Wards by Remington.The Remington model SPT-58 is the same shotgun as yours.
Most likely Mossberg made your shotgun,but I cannot be sure unless you give the model number of your Wards shotgun.
I will start with the fact that you have a shotgun,not a rifle.The 410 is a shotgun round,not a rifle.Next we will need the western fields model number to identify the maker of your Montgomery Wards shotgun and then can describe what type it is.Chances are if you feel that it was a rifle,you could have a bolt action shotgun chambered in 410 gauge.
No published sn data.The western field model M550ar was made by the firm Mossberg and sons for Montgomery Wards(Western Field) The Mossberg model 500AB is the same shotgun.this shotgun was made from 1962-1998.By being a wards Western Field we may be able to say that the time frame will be between 1962-1985 when Montgomery wards went out of business.
Your question cannot be answered without you providing the model number of your Western Field shotgun.This will be needed to identify what type of shotgun you have and who made this firearm for Montgomery Wards(Western Field).
The western field model 172B was made for Montgomery Wards(Western Field) by the firm Mossberg and sons.The Mossberg model 395K and your shotgun are one and the same.The Mossberg model 395K was made from 1963-1983.
You will need to list the model number of your western Field shotgun,and then I can cross reference the model number to the maker of your shotgun.
Lefever Nitro Special made by Ithaca. Montgomery Ward just put their name on it.