I'll be interested to see if that broken tone will happen if you have an equal sized or smaller iron of the coin's size. An electrical knockout with a nickel would be interesting.
I'm not hot to trot about this one like I was when I thought it was two distinct tone sounds. The video shows that the tip has to be nearly right next to the iron to get the breaks in tone.
Not impressed yet. The depth did look pretty good though assuming it wasn't a nickel. I get my best depths in air on nickels with my pointers. jm2c