True Historics were only made in 2015. Most of the Historic line retained the True Historic plastics and parts from 2016+ but did not have two things that the 2015s did: the TH top carve and the wet sanding of the finish. The TH medallion and TH COA were specific to just the 2015s.I have seen True Historic Les Paul models form 2015, 2016, and 2017; just curious, did Gibson make changes/improvements on these as time went on? In other words, is a 2016TH any different from a 2017 TH?