You have the rare version of the model 26,as it has the mannlicher-style stock.The Mossberg model B26M(M is for Mannlicher style stock) was made in the year 1938 only.
Mossberg and sons made your Montgomery Wards(Western field) model 37.The Mossberg model 30 is the same rifle.These were made by Mossberg and sons between the years 1933-1935.The value of a Mossberg model 30 is between 45-100 dollars.
The Mossberg and Sons Model 146B was manufactured in 1954-1958.
Your western Field model 830b was made by Mossberg and Sons for Montgomery Wards(Westernfield).The Mossberg model 340K and your firearm are one and the same.
Your Western Field model M830 was made by the Mossberg and Sons firearms Company.It is the Mossberg model 340K which was made from 1958-1980.
Model 42M(c) was made 1947-1950.
1944-1950
Mossberg and sons made your Western field model 15K.The Mossberg model 80,or the model 83 both apply to your model 15K shotgun.
1950-64 depending on which variant
It was made from 1936-1938.
The Mossberg and Sons model 26B was made from 1938-1941.The value is between 35-100 dollars,depending on overall condition.
Your Montgomery Wards model M72 was made by the firm Mossberg and Sons,It is the Mossberg model 472PRA which was made from 1974-1976.
.Doing an online search, it was made in 1933 and 1934