Hi Chad....I collect based on how the buckle is made and what materials are used. I especially look for variants in the catches and different areas that the buckles might be marked. Back in the day when I started collecting buckles (all TR buckles - not just HJ/DJ) I wanted one of each - but then I got into the variants which allowed me to get even more buckles. I couldn't imagine just having one HJ....You know what I'm talkin' 'bout!
Cheers!
Rob