I'm not a Terzuola collector, but I like his designs, and find this kind of thing interesting -- so I decided to look around Arizona Custom Knives too (I check out the latest additions on a regular basis

).
The asking price for the first all-Ti ATCF below is currently 1345$. It seems to be
basically the same knife, but without the Micarta scale; your knife seems to have a higher and deeper hollow grind than usual, and finer serrations on the gimping. Most of the all-Ti ATCF's are liner-locks, and have asymmetrical handles, something a micarta scale would help 'even out'. Most of the other all-Ti ATCF liner-locks, all asymmetrical, with some differences in the blade grind, were asking similar prices -- one for 1399$, another for 1350$ (originally 1700$), and so on. Very nice knife to have in your collection.
This one, for whatever reason, sold in April for $1875:
Six or seven more all-Ti ATCF's went for somewhere between 1400-1800$ in the past year or so... once you go back a couple years, the prices drop off quickly, so it's not particularly instructive. This ATCF frame-lock with micarta sold for just $625... in 2008

.
I guess it supports the numbers others have given... probably around 1200$, if it were an all-Ti ATCF, but I think the rarity might counter the scuffs, and push it up higher (the micarta doesn't have the 'S' shaped edge curving around the notch that most of the similar scales have... is it possible it's an after-market scale?). Only a Terzuola collector ready to pay for it will give you a clear idea of worth. I'm sure this didn't help to clear anything up, but... meh. For the hell of it, here's a beautiful jade-handled Damascus Terzuola, that's currently priced at +7000$. It's been sitting a while, though: