Chelsea Clock Co. 8 1/2" Carved Base #1. This superbly detailed design was only offered in the 1911 catalog. The carving of the ebonised mahogany base is absolutely gorgeous. The. case has been polished and lacquered. The engraved and silvered dial and pierced serpentine hands have their original finishes. Serial Number 141392 on the movement and case dates the clock to 1920. A very fine example of an exceedingly rare Chelsea shelf clock.