When I looked at that ebay listing of "glass memory" it pointed me to another 
item, https://www.ebay.com/itm/265623663142 -- described as "core rope memory". 
 Obviously it isn't -- it's conventional core RAM.  Interestingly enough, it 
seems to be three-wire memory (no inhibit line that I can see).  It looks to be 
in decent shape.  No manufacturer marks, and "GC-6" doesn't ring any bells.

        paul

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