Antique American paperweights are not my area of expertise - which is why I would appreciate comments on the following weight:

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Diameter 74 mm / height 44 mm / weight 392 g.
Based on the leaves I tend towards Boston&Sandwich - but don't want to exclude NEGC. Could the central cane possibly be a clue? It is not shown in John Hawley's book on B&S and NEGC.
The base is somewhat unusual: the "natural" basal rim is oval in shape, but ground out & polished circular.

Could this be an indication of age, e.g. pointing towards an older piece?
As I said - any(!) comment would be welcome.