https://entertainment.ha.com/itm/music-memorabilia/memorabilia/allman-brothers-band-signed-washburn-melissa-model-acoustic-guitar-with-promo-poster-signed-by-gregg-total-3-items-/a/7414-26149.s?ic4=GalleryView-ShortDescription-071515

I'm on mailing lists from a bunch of auction sites for some collectables I sometimes get into.  I'm not into them right now, but decided to look at some of the items here and came across this.  Doesn't end until April 10th, currently at $11,250 with buyers premium (before tax).  The supporting material imply signatures are real.