They were milled as part of the barrel
your Winchester model 12 standard trap was made in 1939.
The Winchester model 1912 trap shotgun was made from 1938-1964.With the serial number that you provided,your model 12 trap shotgun was made in the year 1921.It could be that yours may not be a trap model due to the date of manufacture!That being said a model 12 trap shotgun will bring between 700-1,200 dollars depending on the overall condition and a good bore.
The Winchester Model 12 Trap Y series was produced in 1954. This model is part of the broader Winchester Model 12 line, which was known for its reliability and performance in various shooting sports. The Trap Y series specifically catered to trap shooting enthusiasts during that era.
The Clock - 1949 The Death Trap 4-5 was released on: USA: 14 November 1951
You must call Browning to find out.
The prefix of 4M to your serial number indicates that you have a Browning standard weight model auto-5 shotgun,which was made in the year 1964.If it was a trap model,it would be so marked.
The Lone Ranger - 1949 Death Trap 1-32 was released on: USA: 20 April 1950
Your trapdoor 45/70 was made in 1880.
Your serial number indicates that your Springfield model 1873 trap door model rifle was made in the year 1885.I would check to see if you have the next model,which was the model 1884.
ABC Stage 67 - 1966 The Trap of Solid Gold - 1.14 was released on: USA:4 January 1967
Animal traps are made of a variety of materials depending on what type of animal your are trying to trap. A mouse trap will be made of wood and metal, a larger animal may require a steel leg trap. A cage may be needed to trap wild animals.
The winchester model 42 slide action shotgun was made from 1933-1963,with a total production fiqure of 164,800.your winchester model 42 shotgun was made in 1937.the value of these fine shotguns based on the standard model is between 1,200 dollars for a shotgun with 60%original finish remaining,up to 1,975 dollars for a fine example with 95%original finish remaining.Prices could be higher if you have a solid rib barrel,or a skeet grade,trap grade,or the deluxe grade shotgun.