I've owned an aluminum upright bass for about 25 years. My main bass has been a 60s Anton Schroeder but it's been slowly losing it's sound- too many cracks and repairs. I just recently refinished the aluminum bass which has a wonderful, if odd, bright sound. And loud! It's also a nice gig bass as it is practically indestructible. It had a faux wood finish which was an ugly mess. I stripped the old paint (which was so thick that I wondered if it didn't have an acoustic purpose) gave it a gunmetal patina and seven coats of satin shellac. I loved the results. After some research, I discovered that what I have is a G.A.Pfretzschner aluminum bass. (not to be confused with H.R. or E.R. Pfretzschner) The ONLY thing I have been able to find out about this person/company is that he/it, along with these strange aluminum instruments, specialized in Stradivarius copies. That's it. No dates, nothing. Does anybody have any information on G.A.Pfretzschner or aluminum upright basses?