Wow. OK, so you're secret detecting spot is awesome! That's an impressive assortment of old coins and tokens; just the ones that can be identified! Hammer heads and other tools can be worth cleaning up too. Electrolysis seems to be best for this, as many forum reports have shown.
Your 24 mm coins? Maybe tokens? I can see what looks like the dog or deer, and what looks like the 1775 on that one, but these images are so faint, it's hard to tell what's original design, and what is imagination/extrapolation. With so many of them, and likely more there to find, keep checking, inspecting, photographing, etc. I don't think they are just blanks.
If you get any better imagery from any other ones, please add to this thread!