1947
Your Marlin rifle was made in the year 1987.
Your Marlin rifle was made in the year 1987,with the serial number provided.
With the serial number that you provided,your Marlin rifle was produced in the year 1979.
Your serial number indictes that your Marlin rifle was made by them in the year 1985.
With the serial number that you have provided,your Marlin rifle was made in the year 1996.
Your serial number indicates that your Marlin rifle was made in the year 1971.
1891
Your Marlin rifle was made in the year 1982,with the serial number that you have provided.
The first 2 numbers are the year of manufacture of your Marlin rifle(72046507)indicates 1972.
There is a web site called "marlin manufacture dates", but it will only give you the year of manufacture, not an actual month and day. Seeings as you already know that it is an 1883 rifle, then you probably know as much as you are going to find out about the rifle.
Your serial number indicates that your Marlin model 336 rifle was made in the year 1980.
The letter M prefix to your serial number indicates that your Marlin rifle was made in the year 1955.