Here's another question that doesn't seem to have a specific answer…
How much is the value of a State of Alabama .50 cent note increased by having such a low serial number, regardless of condition?
Personally, I don't think a low # (below 1000) matters that much when you are asking about a fairly rare/scarce note & for hand-written serials. On some of these limited issues a low # isn't a low # unless its below 100 but TBH, special number collectors typically are usually modern banknote collectors (though you do see some large US types with low #) on issues that were released in the millions. Usually, though, grade trumps everything else (numbers, signatures, Blocks or other variations) when it comes to certain rarities & niche areas.
You've also asked about consecutive # (which is how they're issued). When I first started attending shows 35 years or so ago, I could not believe that consecutive # had a premium & most dealers I knew expected to give discounts (on runs b/c the more you buy the less you pay). I am not sure what/where or who started the “fan fare” on consecutive regular serial #s other than the (false) assumption that they're in UNC? I don't know, but you will see the odd collector pay a little more for certified consecutive pairs (& that's on tough/popular older series). So if you're thinking of selling, they'd need to be certified & then sold in pairs (if you were hoping for a premium). You take your chances b/c submitting notes for certification is pretty costly (& the most minor issues can be missed knocking notes down below UNC). The consecutive pair types usually expect Gem Unc 65 minimum.
(There's no such thing as “regardless of condition.” That's like saying what would this property be worth & oh lets just ignore its near this nasty part of town with all the crime- it just doesn't happen in the real scheme of things)
Anyway, those are my opinions which may be incorrect (or somewhat biased). To get another (probably more informed opinion) I suggest you check out: The Paper Money Forum (register, post your images & enquire). There are many more US banknote specialist over there.
Good luck!
