This is a UNC note, does it have any additional value due to the serial number? And what's this kind of number called?
Depending who you are asking. I would not say quite, but it's unique. Some collectors from the Far East may not like this note as it contains the nos 7s.
Again, this is just my opinion though. I am always biased as usual.
American collectors (of 8 digit US $1.00) call XXXXYYYY notes “2 of a kind.” They're hard to get b/c of the long string of digits (less chance to find one). You could call yours a “2 of a kind” but I am unsure whether there will be the same kind of following for your Solomon Island example.
Canadian collectors have 7 digit notes so we may get a note with the XXXZYYY pattern & the few of us who keep them call it a "3 of a kind." I have a few as I've searched so many bricks/bundles of notes, you're bound to run into them. They're not listed in our catalogue section reserved for “Special Serial Numbers” so they're not actively sought but more like “fringe” or “fancy” birthday # notes (a niche).
Also, some # combos will be more popular than others (such as 0001222, or 6667888 that type of thing).
