The letter Z prefix points to the year 1964,when your Marlin rifle was made.
The letters AA identify the year of manufacture of your Marlin 39A golden Mountie as 1965.
What year was Marlin 39A Mountie S/n 19968 made
Your marlin golden 39A mountie with the serial number you provided was made by marlin between late 1960-august of 1961.
The letter U prefix to your serial number indicates that your Marlin model 39a golden mountie was made by marlin from 1960-aug.1961.
your marlin 39A was made in 1965.
The answer is 4500
I can say that your Marlin model 39a golden mountie was made from 1953-1972.With the serial number that you have provided,yours was made in the year 1971.
1963. sales@countrygunsmith.net
1967
YOUR 39A WAS MFG. IN 1963
The prefix letters AC indicates that your Marlin model 39a Mountie was made in the year 1967.
1957-1958.