It's a canebrake or timber rattler depends on where you're from. We have diamondbacks but haven't seen one yet.
Amazing technology those digital cameras the close up was about 2 foot away. Notice it isn't coiled up so striking distance is going to be very short. Never rattled or got upset even when I tailed it to the woods.
Great specimen though good color size was a bit small can't make a real determination on how old it was rattles don't always equate to age.