As Oregon Gregg mentioned below, I had similar double silver dime success just this past week using my #2 FORS CoRe with a new open-framer FC24 [size=small]
(5X9½ DD)[/size] that I borrowed from Gregg. I don't have the FC24 coil ...
yet ... but definitely plan to have BOTH the FC24 and FR24 in my working detector and accessory coil battery soon for my CoRe and Relic models.
Oregon Gregg has had the MARS or NEL or CORE aftermarket coils of a similar size for his FORS CoRe and Makro Racer/Racer 2 units, and he offered me the use of his new FC24 coil to "check-it-out." I did, hunting a site about 20 minutes from either of us that has given up a few older period coins from the early-to-mid 1900's for us. So I swapped out my 7X11 DD I kept on FORS CoRe #2 for the new 5X9½ open-frame DD and proceeded to hunt a well-worked area at this older park.
In less than 30 minutes I had a good clean audio response that was mixed in with a lot of nearby discarded iron junk. The audio response was complemented by a reasonably repeatable visual TID that gave me a numeric response that almost locked-on. The target,
soon to be two targets, was located between 6" and 8" deep amongst some iron debris. I cut a plug in the dirt and weeded area and recovered a 1945-S Mercury Dime. Checking the hole I still had a nice repeatable responses and on the edge of the hole, maybe 1½-2 inches aside from where the first one came out I recovered a 2nd Mercury Dime, but this one was a 1937-S mintage.
Like you, I find the Mercury dimes to be a nice looking coin, especially the pillar on the reverse side. Maybe 15 minutes after that I found a very nice condition 1930-S Wheat-back [size=small[color=#0000CC]](Lincoln)[/color][/size] Cent no more than 15 feet away from where I recovered the silver dimes. Most of the time I work the densely littered sites with my small 'OOR' DD coil [size=small]
(the 4.7X5.2 DD)[/size] on my CoRe and will save the mid-sized DD coil, when I get it, for the low-to-modest trashy places, but this was a 'test time' for me so I selected one of the trashier locations at this particular older-use site.
I am sure you're going to continue to enjoy success afield with the new 5X9½ DD FC24 coil, as well as the
'OOR' coil when you can get some time in with it. Part of the reason you'll enjoy success with these coils is because they will be mounted to one of the best general-purpose detectors out there, the Nokta FORS CoRe.
Monte
[size=small]
PS: A comment of coin depth. Note the 6" to 8" depths of the dimes I mentioned finding above. This was not an exaggerated depth guess, and it wasn't due to "coin sink rate' because coins don't. Most of the coins Oregon Gregg & I have found at this old-use site have been between ±1" and perhaps 3" or just slightly more. But where I found the two dimes, the ground build-up is very apparent as the root structure of the two large side-by-side trees is deeper and out-of-sight and you can see a rise in the ground where the soil has been pushed around and deposited around the trees for about 6' to 10' out from them, thus causing the deeper coin positioning.[/size]