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Hi Nick.
Correct - a low domed Arculus weight. It is very hard to distinguish Arculus and Walsh Walsh items, as Walsh Walsh ending up owning the Arculus factory and produced very similar paperweights at both (probably mixing canes from the two and from different periods...). However, the 'Chequer' weights and these low dome weights are believed to be Arculus factory. The larger versions (approx 3 inch to 3 1/2 inch diameter) vary from awfully messy to very neat, and often have '1848' date canes in them - see images below.
Alan