Here are three dimes I have that all appear to have collar clashes, but I’m a little bit confused because they seem to be not super strong but more of a finned rim. Like only some parts have a reeded appearance. Coin 1 (certain is collar clash) Coin 2 (Looks like it could be but only in some parts? Also unlikely because it’s on the avil die?) Coin 3 (maybe at the end?)
I'll try and explain what you are seeing. It's not the coin that clashes with the collar die, it is the hammer die that clashes with the collar die. That clash is then transferred to the coins struck by that hammer die. To understand how this happens, you, you have to understand how the coin press works. I know that you've seen coins that were struck with .misaligned dies, where the rim on one side of the coin is wider than the other. Well, for the hammer die to strike the collar, it would also be misaligned and would only strike the collar on one side. The more it is misaligned, the larger the collar clash.
Oh right, I forgot it had to be misaligned. But does that mean that these are collar clashes even if only part of the grove in the rim appears reeded? If so, how might this occur?
The die was misaligned when it struck the collar. After that, it was probably adjusted back into alignment. The coins struck after the realignment will have a rim consistent in width, but have partial details of the collar, in this case, a reeded collar.
So it is a collar clash per se, but I doubt it's of any value because if it can form with the commonality of a misaligned die.