Can't Wait!!! Just got me a mid-80s Nautilus DMC VLF(the original DMC model). Gonna give this baby a whirl when the weather clears up and have a few sunny days. Heard these are (very) deep machines. They're actually the older i.b.(induction) balance type. Mine came with the 10" concentric coil.. Most modern machines use induction balance in the form of VLF except for the pulse and multi frequency type. All VLF are an offshoot of the induction balance types. You also had the older T/Rs(pretty deep if tuned correctly; ie; the Garrett Master Hunter ADS Deepseeker but was battery hungry; took 6 9-volts) and BFOs of which neither are used much anymore. BFOs, understandably so. They never went very deep but then again, in the 60s and 70s, much of the now foot-plus deep silver was near the top of the ground and most any detector, weak or powerful could have gotten a lot of the goodies back then. Even those old bulky 'tot', kiddie detectors were merciless on the silver near the surface, LOL. Nowadays it (DOES) take a (super) deep machine to find even some clad coins. Not uncommon to be digging 'zincoln lincolns' up to 8" or more in loose, dark, loamy-type river soils. So if these annoying pennies are found this deep, (imagine) how deep the remaining silver is, and (especially) the pre-1900s silver. Just think about that one for a moment.....There was a YouTube video of 1800s coins being found at a Dallas, Texas park, even after an 8" top layer of dirt was removed, another 7" down. 15" down total !!