I have dug silver dimes at least 7 inches with my Tejon before with a solid signal and Killer B's headphones. I'm sure it will go much deeper than that on a dime in good ground.
Quality headphones are a must with the Tejon to hear those really deep small targets. It loves nickels, lead and brass items. My Tejon is about 3 inches deeper than my Vaquero, so I traded my V.
All I can tell you is make sure you have a good digger and be prepared to dig, because you will be amazed at the depth of the Tejon. Also, ground balance it in the disc mode with the trigger switch held in, much easier
to ground balance in fast retune than the all metal slow retune mode........HH
Roger