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A Thomas Tompion Phase I timepiece estimated at £65,000-90,000 at Bonhams.

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Made c.1680-85, before the advent of Tompion’s numbering system, it is one of only five Phase I clocks of this type known to exist.

This series of clocks have the bell set into a cut-out aperture in the backplate, necessary because at this time Tompion used a backplate that was larger than the frontplate.

It is estimated at £65,000-90,000.

bonhams.com