IMO, the 27 is a G, the other 3 are F. The pictures are a little blurry to be certain, but it looks like they all have considerable cord and hair detail, with good wreath detail on the rev.
As far as selling individually or as a group, assuming you're doing
ebay it's kind of a tossup. Buyers will factor shipping into their decisions, and PayPal hits you with the 30 cent per item fee, so, while individually is generally the best bet, you might not do any better on net than selling them together. But it's hard to say, there is just so much randomness on
ebay from day to day and lot to lot.
My guess is that you should get $17-20 each for the 3 later coins, less fees of course, maybe $15 for the 27?
The 1846 does look like a small date, but in this grade, there doesn't seem to be any difference in pricing between the date variants.