50-150 or so
Model 42M(c) was made 1947-1950.
1944-1950
Your rifle is a Mossberg Model 42M, made between 1940 and 1950.
Depending on condition, from $100-200.
Assuming you mean a Mossberg Model 42M(b), between $75 and $200, depending on condition. These are excellent target rifles.
Go here: <http://www.havlinsales.com/> Click on .22 parts & scroll down 1/4 of the page for MOSSBERG .22 SCOPE MOUNT For models 26B, 26C, 42A, 42B, 42C, 42M, 43, 44US, 46A, 46B and 46M.
42m equals -966 = -924
This is a previous trademark used on Montgomery Ward Rifles and Shotguns. Most of these models were manufactured both domestic and international through subcontracts. this model is a knock off of the Mossberg 42M mfg. between 1940-1944. It does not have the "good" wood or the trapdoor buttplate for the extra magazine.
It can be simplified to -41m
90
42m
The pH of a 42m HCl solution would be approximately -log(42) = -1.62. This solution is strongly acidic.