As far as we know, only three or four original specimens of the Roman hand abacus have survived. Three are made of bronze and are located in Aosta (Italien), Paris and Rome (see Figs. 1–3).
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A fourth device is known to exist, but no one knows where this is. It is made of ivory, see In Search of A Rare Roman Pocket Calculator | blog@CACM | Communications of the ACM
But how does one calculate with Roman numerals? See
Source
Bruderer, Herbert: Milestones in Analog and Digital Computing, Springer Nature Switzerland AG, Cham, 3rd edition 2020, 2 volumes, 2113 pages, 715 illustrations, 151 tables, translated from the German by John McMinn, https://www.springer.com/de/book/9783030409739
Herbert Bruderer is a retired lecturer in didactics of computer science at ETH Zurich. More recently, he has been an historian of technology. bruderer@retired.ethz.ch, herbert.bruderer@bluewin.
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