What you have there is a COA -- certificate of authenticity. It's just an interesting gewgaw, really, affirming that it's not a cheap Chinese counterfeit (which is not only absurd, but how do you prove the COA isn't a fake...?). The only COAs I know that are interesting have been signed by someone famous.
While it's cool to see that it's "one of 500," the fact is that (as I mention elsewhere) ~60% of Washburn models (1974-2010) saw no more than 200 produced. For all we know, the D49 may have stopped at #200 as well. In any case, it's not particularly more rare than most other Washburns. (Compare this to a new "Custom Shop" Fender I recently saw that crowed how it was "limited to only 1,000."
The only "125th" guitars I'm familiar with that're holding good value are the R-series parlors.
You can also check the catalogue: http://www.washburn.com/media/catalogs/pdf/Washburn2008Catalog.pdfw
Some years back, I tried a D46SP at a local store. Loved the looks, enjoyed playing it, only $400 new... but I walked away because I was hoping for a bit more. I lucked onto a tail-end D46CESP that cost me like $460 on an MSRP of $1,020. I've gotten some joy from it, impressed a few other players, & if I'm REALLY lucky might be able to sell it for ~$400 (with case) -- as with so many Washburns, it doesn't matter that it's an EXCELLENT guitar, because there's simply no market demand for it.
So... what's my guitar worth?
There's an absolute fetish for "solid wood" or at least "solid top" guitars, which means that
- there's a lot of "real wood" guitars out there that really don't sound very good yet are priced at double or even triple what they'd be worth to a player who's both sane & knowledgeable
- there's a lot of "plywood" guitars that not only sound pretty good (& will likely outlive most "wood" guitars) but are going for a fraction of their realistic value as an instrument
One result is that the return on your D49 is significantly less than (say) the D46SK.
Your D49 is basically a D46 with more inlay & the "125th" gimmick. The models were available 2008-2010 at most. Per a note in Bluegrass Today
, Sept 05, 2008 --
The D49SP carries a MSRP of $999.90 and the D49CESPK $1169.90.
Yeah, I noticed that little bit of paper or whatever under the E string -- this is problematic. Bridge saddles DO NOT wear quickly, ESPECIALLY for the unwound strings. Therefore, it's been broken OR it's been cut down too far in attempting to make a super-low action OR either the top is caving or the neck is warped.
What it's "worth" depends entirely on why you want to know. FFI, read my previous rant --http://forums.washburn.com/index.php/topic,26499.0.html
But IF the neck & body are perfect & IF you fix the bridge & IF there's absolutely no nicks, chips, or other blemishes, then it's "worth" about the same as my D46.
Given that it's been around for almost 20 years, it would likely benefit from a proper setup & adjustment, something that really ought to be performed annually. Unless you know how to do that yourself, it's a well-spent $50.