I'm working on pottery ['samian ware' or terra sigillata] from a Roman amphitheatre, amongst which the epigraphist has suggested one incised base as possibly representing an improvised abacus, if not an ersatz gaming board. 

Pliny and Martial refer to ‘counters and a board’ (calculos tabulamque). 

Does anyone know of any abacus, ersatz or otherwise, found at a Roman arena?

At an amphitheatre, an abacus might be used for ticket collecting, adding up scores, etc. Are there references [ancient or modern] to betting at amphitheatres or in the circus? 

Measurements and further details are given on page 2 of the comments below. Any further comments on measurements, etc, will be gratefully received! Its precise function, whether calculating table or gaming board, is uncertain without more convincing evidence.

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