Nice finds. First one is definitely 1913. Value, though is low. Maybe 25-50 cents.
I've seen debate on whether a G4 is two date or full 4 digit date. For example, even if you see only the 2 and 0, you know it must be 1920, but can't see the 1 and 9. Partial date bulk lots can be bought for only 35 cents apiece (which amazes me, only 7x above face value). No dates are running 3-5x (usually 4x) face value on
ebay. I agree with what was said above that acid restored dates are typically selling for about 1/10th the G4 value. A 13S T2 restored key generally sells for around $30-50.
I do think at some point that restored dates will gain some momentum, because the
Buffalo nickel series is very popular yet most people can't drop 50, 100, or more for the many semi-keys and keys. So the natural tendency is for collectors to fill their collection with lower grade pieces.
In just about every dateless
Buffalo nickel lot I buy that contains mint marked coins, I find a 13S T2, so maybe the way to go is to buy lots of dateless coins, restore the mint marked ones, keep some as fillers and sell the rest, especially the 13S T2 Key. Then use the proceeds to upgrade your collection to better grades.