1981 D-25M. Unfortunately, Guild is notorious for having incomplete production records, so it is not surprising to have a Guild guitar that is not officially recognized anywhere!
Turns out this was a lefty model that was later converted to a righty with a new bridge and compensated bone saddle, bone nut, and second pick guard a la Richie Havens' Guild Signature Model. The original tuners had also been replaced with Sperzel locking tuners. Condition-wise, this D-15 was in good shape besides a few small dings. The action was good and the sound clean. The seller, a professional musician, was winnowing the herd. With a few other interested parties in the wings, I was only able to negotiate a small reduction in the asking price, but it was too good a deal on a classic Guild to pass up.