Vermont Clock Co. 8 1/2" Tandem Wind Ships Bell Clock with external bell. All of the known Vermont tandem wind ships bell striking clocks have movements by Boston Clock Co. This clock has the Boston Clock Co. movement with the McMillen's 1901 Patent updated single hammer strike design. An exceedingly rare ships bell striking tandem-wind clock especially in this large size. The clock is mounted on a custom mahogany display stand.