The Savage model 755 and 755a were made from 1949-1958.
The savage model 755a was the follow up model to the Savage model 720 auto loading shotgun which was made with John M Brownings patent.The model 755A was available in 12,or 16 gauge with a barrel length of 26in,28in,or 30in.Various chokes,rounded off receiver,and checkered pistol grip stock.These were produced from 1949-1958.
I can say that the savage model 775 shotgun was made between the years 1950-1965.I am afraid that is the best That I can do.
your Western field model 60 shotgun was made by Savage arms for Montgomery Wards(western Field).The Savage model 620A and your shotgun are one and the same.If you go to Savage arms home page,they may be able to say when the model 620A shotgun was produced.
The savage model 775 standard semi-auto shotgun was made between the years 1949-1958.The model 775 lightweight semi-auto,with a alloy reciever was made between the years 1950-1965.The savage home page may help you determine the exact year of manufacture,give em a try.
Your Savage model 46 was made by Savage Arms from 1969-1973.
Your savage model 72 was made during the years 1972-1989.
The Stevens/Savage model 987 was made from 1972-1989.
Made in 1939
Your savage model 30F was made by savage/stevens from 1970-1975.
the savage model 170 pump rifle was made from 1970-1981.
your Winchester model 1912 shotgun was made in 1914.