Pair of Antique Victorian Walnut Revolving Bookcase Tables

Very rare pair of antique Victorian revolving bookcase tables in walnut. They have circular tops, turned central columns, spinning book holders in the centre & sit on strong inlaid tripod feet. I have seen single versions of these tables, but never a pair. They are in good original condition & I would say they date to around the 1880 period.

Width across the middle --- 20" (50cm)
Width across the top --- 15" (38)
Height --- 29 1/2" (75)