Raspy, another interesting point of difference is that the 696 has a heavy barrel (straight or nearly straight taper from frame to muzzle) with a full underlug; whereas the 624, of any length, has a lighter-weight tapered barrel which starts off as thick as the heavy barrel at it's junction with the frame, but then quickly tapers to a thinner profile which extends on out to the muzzle. Hard to really compare apples-to-apples as far as the difference this makes, because the frame size difference plays into the overall weight issue as well... But, it is a visual cue (along with counting the flutes and their locations on the cylinder, as the five-shot and six-shot cylinders have the flutes line up very differently) that can quickly discern a 624 from a 696.