The firearms company Tangfolio.
your Winchester model 75 was made in 1942.
Your Glenfield model 75 was made in the year 1972 with the serial number that you have provided.
High Standard made the Model 75 for Sears. http://www.histandard.info/PDF/Sears%20Shotguns.pdf
The Glenfield 22 model 75 is the same as the Marlin 75. It was made for Sears and the parts probably can be obtained from Marlin In New Haven, Connecticut. This site has parts for the Glenfield model 75. http://www.gunpartscorp.com/ I have them. www.countrygunsmith.net
Model 75 was made from 1931-1961 by Cooey (Canada) and then bought out by Winchester who made them as Model 750s until 1978. If you have no serial number that is due to the change in the Manufacturing laws. 1968 and after should have serial numbers.
Can't be answered without knowing who made it.
MADE IN THE PHILIPEENES, ABOUT $75
1938 thru 1958
the value of your model 75 Winchester depends on many conditional values such as amount of blueing left wood condition etc. but your model 75 Winchester was made in 1941.
$50-$75
Between 1973-75
There is no such model number. What ever you have was made in 1980.