Does anyone know when Warwick went from using Wenge to Ovankol for the necks on the Thumb bolt-ons? Also the same question for the switch between the brass Just-A-Nut and the black Just-A-Nut II? The reason I'm asking is I purchased a new Thumb 4 bolt-on and this one had an Ovankol neck and the black Just-A Nut II. This bass however had quite a few cosmetic flaws and was replaced with another Thumb 4 by Music 123. The replacement bass is slightly lighter weight and has a Wenge neck and a brass Just-A-Nut. This bass is brand new? The wood is nicer grained than the first one. This one was pulled from Music 123 parent store which is Zapf's music in Philly since Music 123 didn't have any more Thumbs in stock to replace my first one. I'm thinking that this one probably hung in the Philly store for a few years which would explain the difference in the neck wood and the nut. Can anyone shed some light? Also did I get a better bass than before or is it only a cosmetic difference? Let me hear your opinions?