On my monitor it looked like a modern metal pull similar to what you see on kitchen drawers !!
LOL, no, it's shiny from the flash and well worn but most pulls that are original from this period were wooden pulls. The dealers table with brass pulls, in description does not mention "original pulls" which means, they are not original. I'll try and take a close up pic later today of one of the original brass pulls on my blanket chest, front and back so you can see how hardware was installed back in the day. The front of the pull is brass but the back of the pull that attaches to back of drawer or case is iron wire and hammered into the wood. No screws, no nuts so it's very easy to determine on a piece this old if pulls are original or not as it scars the wood. Once that iron wire is hammered into the wood, it's like a fingerprint and that's THAT, it can never be replicated again and easy to see up close. Even though it does not effect value much, i am VERY happy my blanket chest has the original brass pulls, a good break for me.
On the dealers not original pulls, it doesnt say but i would think those pulls are made in the same way as original ones were, cast brass fronts with iron wire hammered into back of drawer. You can still purchase pulls today that were made in the same way they were 300 years ago, not cheap though, a lot of hand work involved as would be expected.