How do you find the year of a Magnavox console stereo?

There are several different ways to tell. If the console has a built-in 8-track tape player, its likely from the 1970s. If the radio face says ASTRO-SONIC its from the mid or late 1960s. Also, assuming the record player hasn't been swapped out in the past, that's a good way to check. From the late 1950s to the mid 60s, the needle arm was black with a gold elliptical piece in the head. In the late 60s the arm was very slim and gray. Towards the early 70s, it was even slimmer and silver. Hope this helps.