1977-D Silver Half - Call Me Crazy!

no offens but that video was lame an didnt do anything we could not see what coins were being droped
they indt even sould dropped but more like clung together

film it agian show the coin up close incluing the side
put it in the middle of a nickleclad silver clad an silver
should end any debate

The '77d is the 6th coin from the bottom in the stack, the '66 is the 6th coin from the top of the stack.

I am not steven spielberg here so cut me some slack on the video, you can hear the coin stack being dropped in my hand and when the sixth coin (77d) falls you can hear the obvious difference. I even have a small pause after it to make it obvious. If I do have a rare coin on my hands forgive me for not wanting to drop it on my tile floor. I will see what I can do different with the video to make it better.

You know, this "drop test" thing bugs the heck out of me.
When I handle coins, you can hear a pin drop, I open a roll and not one coin clinks next to another. I just cannot imagine dropping a coin on a hard surface to hear it ring. especially if it is valuable or might be.
When I see dealers spill out tubes of UNC coins on a hard glass counter for me to choose from, I just wonder how many times that roll has been through that and what the coins could have been if they were handled with more care.
A dig here, a scuff there lowers the grade.
Call me over protective but I would rather have a mystery for awhile longer than to have an answer with a scratch or rub on it.
The tissue test sounds like a much better idea to me.

WEIGHT IT.

You say if you hold it just right you can see a copper layer on the edge, I am no half expert nor do I roll search but I would think silver shouldn't have the copper ring on the edge

Perhaps the clad layers are not the correct proportions. This would change the way the coin sounds when dropped, and explain the minimal visible copper you are explaining as well. I have read on this forum that blanks sometimes are not quality controlled too extensively and if weight is correct then the layers can vary.

You should perform the tissue test as described by Biokemist, using that 1966 silver-clad half plus some ordinary non-silver coins as references. If it passes (and you're still convinced it is a silver-clad error) then invest the grading fee to send the coin to ANACS for authentication. If it's the real thing the grading fee would be a negligible expense compared to the value of the coin. Weighing the coin would (as mentioned) give inconclusive results. The specific gravity test would be better but it is a bit tricky to perform and requires a good lab-quality scale for accuracy.