The "Ranger" name is almost always a Sears sold shotgun. Sears itself never made guns, they just got them from other makers and put their name and numbers on them. It could have been made by Marlin, Winchester, H&R, etc., etc. If you have a Gun Parts catalog, they used to have a table with all the Sears sold guns and their model numbers that told who actually made them.
As for year, does the gun have a serial number? If it was made before 1968 (GCA of 1968) it may not have one. This is perfectly legal as most lesser price guns did not have serial numbers as they were not mandated by law until the GCA of 1968. Only the serial number will give the exact year, if the records still exist.
Depending on exactly how old, condition and chamber length this gun may or may not be safe to fire. Have it checked out by a competent gunsmith first.
I seriously doubt it has much if any collector value, but that could change depending on exactly who manufactured it.