Holy Grail Guitar Show '18 - Ergon Guitars Coimbra JR & Lisboa Demos Shawn HammondMay 30, 2018VideoPortuguese luthier and former Anthrax and Ozzy Osbourne guitar tech Adriano Sérgio shows off two of the most mind-bogglingly gorgeous and unique electrics at the Berlin show.holy-grail-guitar-show-18whats-newvideosgear-show-demoguitarsergon-guitarsgearGearReviewsElectric GuitarsVideos