Free: Contests & Raffles.
There is several things you could go off. Like RadSav mentioned, the mature toms will tend to be the most dominant. They will likely strut more, gobble more, and keep the other toms at bay around their lady folk. Beard length can also give you an idea, although merriams really dont get the thick paintbrush type beards that Easterns usually have. And of course spur length, but that is difficult to tell unless you have a bird hanging out 10 yards away or you can sneak a peek with your binos while hes not looking I have also heard birds that have an extremely raspy gobble that turned out being old birds after I harvested one bird. For example, this coming spring will be the 5th year I have hunted one really old and smart bird on a private dairy property. I know its the same bird because he has a very distinctive tone and length to his gobble. When I hear him gobble, its a dead giveaway. He's also got a beard that would put most Eastern beards to shame. Maybe this is the year he finally makes a mistake...
what about tracks?How long do the tracks get for a big tom?Ive been seeing tracks from this one for 2 years now and it has prints that are every bit of 4 inches long.