So I have handled a lot of things before, this is a first for me. I have a 925 sterling silver 869gram puzzle cube. I have never seen one before and have had it confirmed as 925 silver with an xrf test on several points, it feels super heavy in hand and would make a great paperweight or self defense item (if someone throws this at you then you will be in a world of hurt) with sharp quality lines and polished surfaces (some light scuffing from use) it is a bargain at $900, however the catch is I have pulled it apart and haven't been able to figure out how to put it back together yet so it may not be delivered completed. about to give it to my 15yo son to do so I expect it will be done but no guarantees given
That is an absolutely lovely piece, never seen anything remotely like it in silver. I have a very similar one in wood, this solution video may help you solve yours: Good luck with the sale, will be watching it with keen interest!
I believe that was made by Baird. Saw one in London and at Perth Bullion many years ago. Backup Buzz.