Wow! Great day there! Standing lib quarters are always a rare and nice find. I think I've dug 6 or 7 over the years, and none that I can remember had a date but the last one I dug, because they wore fast due to the raised dates. Later they redesigned them so the date was recessed and wouldn't wear it or the lady as fast, so if you get a standing liberty before the date they changed them and it's still showing a date, DON'T CLEAN IT! Because it might be worth a good buck. Mine was a 1921 I got a few months back in F-12 condition and the going price was like $350 to $450. I should have checked the sold item search function on Ebay because I let mine got for $150 without doing anything but checking an old coin price book I have laying around. Still, never look a gift horse in the mouth.
Many like those 8" Tornado coils, which are only 7 & 1/4" in actual size, so they get really good separation for people and I've read of coins around 12" deep being dug with them, so they still are a deep coil for their size. Sometimes a smaller coil will get more depth if the ground is badly mineralized or has a lot of black sand or such in it. Read of a few guys who said their 8" Tornado gets more depth for them then their 10" Tornado due to their nasty ground. Even if a bigger coil is seeing as deep it can degrade the target ID by sucking up too much ground signal, so they also have their place in really bad ground and not just for heavy trash. I suspect many guys who like them as everyday coils over the 10" have good reason. You have a smaller coil so it's seeing between targets, yet it's getting deeper than 10 or 12" coils on many non-Minelabs out there, if you know what I mean. My 5.5" S-5 gets more depth in my soil than an 8 or 10" coil on all the other non-Minelabs I ever owned in my soil. I'm thinking on a dime it might do about 9" from what I've seen so far, where as the best of my non-Minelab units would max out at about 7 to 7.5" on a dime in my soil.
Again, great finds there!