Finally I found a used 10.5" DD 18.75 KHz coil for my X-Terra 70. Got it from the UK. That's a fine thing for me, because shipping was cheap and I haven't to pay tax or custom fees. Tried the coil today in a local park. I have to say that it works very well for me. You can cover a lot of ground, run it with a higher sensitivity as the standard concentric coil on the same ground and even pinpointing was easy (I would recommend to use the pinpoint mode and X-cross the target to locate it). I could only spend an hour hunting, but found a couple of older coins, a heard shaped (cheap) pendant and a small earring. I cant wait to use that coil on a beach or for relic hunting.
Have a nice day, Peter
Have a nice day, Peter