[SIGCIS-Members] Where is this ivory Roman hand abacus?

[herbert.bruderer at bluewin.ch]

Dear all
Does anyone know where this very rare Roman hand abacus made of ivory is?
https://cacm.acm.org/blogs/blog-cacm/235956-in-search-of-a-rare-roman-pocket-calculator/fulltext   
Many thanks for your help.
Best,
Herbert

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