I did 2 short dives on one in fla when there were not many of them blew my mind at the time....I had a chance to buy one for a couple of thousand a few years ago . I really want it because .....but need to put the cash elsewhere
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An American former mine clearance diver told me his rb was milled out of solid beryllium. Now beryllium is toxic but in a solid, ultra clean state I guess it must have been safe. That would be my guess for the most expensive rb.
Berillum is a special metal which you can not buy/sell in the market without s special permission. One of my clients (bank) repossessed berilllum from bankrupted company (it was a collateral for the bank loan). They could not ell it for 5 years. Finally they received permission from US (bank was located in Lithuania) and sold it to US customer. AS fr as I know berillum is not radioactive, however, it has some features which are not good for human health. Accordingly, I doubt that rb was made from berillum.